Difference between revisions of "User:Remig/plico/tug"

Latest revision as of 17:15, 12 April 2016

Tug allows the user to pull or push by mouse actions to move or rotate one part of a polypeptide against the rest by rotation on its psi and phi bonds with collision detection and restriction. It also allows the user to move an entire chain to nest against another chain. A full description of its capabilities can be found here.

Tug is a member of the Plico suite of protein folding tools described in User:Remig/plico . It may be installed and accessed as a macro with the file:

Title=PLICO Tug
Script=script <path to your scripts directory>/tug.spt;plico_tug

saved as plicotug.macro in your .jmol/macros directory as described in Macro.

Copy and paste the following into a text editor and save in your scripts directory as tug.spt.

#   tug - Jmol script by Ron Mignery
#   v1.20 beta    4/12/2016 -axis is now a reserved word
#
#   Translate or rotate a stretch of a polypeptide against itself
#    or against other chains by mouse actions
#
kTug = 3
gCanchorIdx = -1
gCanchorNo = -1
gPlico = "TUG"
gNanchorIdx = -1
gNanchorNo = -1
gCcargoIdx = -1
gNcargoIdx = -1
gCcargoNo = -1
gNcargoNo = -1
gDestAtomIdx = -1
g1pivotIdx = -1
g2pivotIdx = -1
gSelSaves = ({})
gCrotors = array()
gNrotors = array()
gOkCollide = ({})
gChain = ""
gMinNo = 1
gMaxNo = 9999
gCargoSet = ({})
gMovingSet = ({})
gBusy = false
gSCidx = -1
gSCcircle = -1
gSCpt = {0 0 0}
gTargetPt = {0 0 0}
gNewDrag = false
gTow = false
g1dynamicIdx = -1
g2dynamicIdx = -1
gSCcheck = true
gBondPicking = false
gFreeze = array()
gToab = false


function get_cp_idx (idx) {
    var no = {atomIndex=idx}.atomno
    while ((no < gMaxNo) and ({(atomno=no) and (chain=gChain)
        and thisModel}.atomName != "C")) {
        no++
    }
    return ({(atomno=no) and (chain=gChain) and thisModel}.atomIndex)
}

function get_cm_no (iNo) {
    while ((iNo > 0) and ({(atomno=iNo) and (chain=gChain)
        and thisModel}.atomName != "C")) {
        iNo--
    }
    return iNo
}

function get_nm_idx (idx) {
    var no = {atomIndex=idx}.atomno
    while ((no > 0) and ({(atomno=no) and (chain=gChain)
        and thisModel}.atomName != "N")) {
        no--
    }
    return ({(atomno=no) and (chain=gChain) and thisModel}.atomIndex)
}

function get_np_no (iNo) {
    while ((iNo < gMaxNo) and ({(atomno=iNo) and (chain=gChain)
        and thisModel}.atomName != "N")) {
        iNo++
    }
    return iNo
}

function get_cb_idx (BBidx) {
    var no = {atomIndex=BBidx}.atomno
    var i = 1
    for (; i < 5; i++) {
        if ({(atomno=@{no+i}) and (chain=gChain)
            and thisModel}.atomName == "CB") {
            break
        }
    }
    return {(atomno=@{no+i}) and (chain=gChain) and thisModel}.atomIndex
}

function get_o_idx (BBidx) {
    var no = {atomIndex=BBidx}.atomno
    var i = 1
    for (; i < 4; i++) {
        if ({(atomno=@{no+i}) and (chain=gChain)
            and thisModel}.atomName == "O") {
            break
        }
    }
    return {(atomno=@{no+i}) and (chain=gChain) and thisModel}.atomIndex
}

function get_nward_bb_idx (idx, iChain) {
    var no = {atomIndex=idx}.atomno - 1
    for (; no >= 0; no--) {
        var atomName = {(atomno=no) and (chain=iChain)
            and thisModel}.atomName
        if ((atomName = "N") or (atomName = "C") or (atomName = "CA")) {
            break
        }
    }
    return ((no >= 0) ? ({(atomno=no) and (chain=iChain)
        and thisModel}.atomIndex) : -1)
}

function get_cward_bb_idx (idx, iChain) {
    var no = {atomIndex=idx}.atomno + 1
    for (; no < gMaxNo; no++) {
        var atomName = {(atomno=no) and (chain=iChain)
            and thisModel}.atomName
        if ((atomName = "N") or (atomName = "C") or (atomName = "CA")) {
            break
        }
    }
    return ((no >= 0) ? ({(atomno=no) and (chain=iChain)
        and thisModel}.atomIndex) : -1)
}

function get_sc_set (scIdx, iChain) {
    var scSet = ({})
    var idx = get_sc_bb_idx(scIdx, iChain)
    var iNo = {atomIndex=idx}.atomno + 3

    for (var i = 1; i < 20; i++) {
        idx = {(atomno=@{iNo+i}) and (chain=iChain)
            and thisModel}.atomIndex
        if (is_bb_idx(idx)) {
            break
        }
        scSet = scSet or {atomIndex=idx}
    }
    return scSet
}

function get_sc_bb_idx (idx, iChain) {
    var no = {atomIndex=idx}.atomno
    for (; no > 0; no--) {
        if ({(atomno=no) and (chain=iChain)
            and thisModel}.atomName == "CA") {
            break
        }
        else if ({(atomno=no) and (chain=iChain)
            and thisModel}.atomName == "C") {
            break
        }
        else if ({(atomno=no) and (chain=iChain)
            and thisModel}.atomName == "N") {
            break
        }
        else if ({(atomno=no) and (chain=iChain)
            and thisModel}.atomName == "CB") {
            no -= 3
            break
        }
    }
    return {(atomno=no) and (chain=iChain) and thisModel}.atomIndex
}

function is_bb_idx(aIdx) {
    var ret = false
    switch({atomIndex=aIdx}.atomName) {
    case "N":
    case "CA":
    case "C":
        ret = true
        break
    }
    return ret
}

function is_sc_idx(aIdx) {

    var ret = false
    if (not is_bb_idx(aIDx)) {

        ret = true
        switch({atomIndex=aIdx}.atomName) {
        case "O":
        case "CB":
            ret = false
            break
        }
    }
    return ret
}

function select_add_sc(fromIdx) {
    var iNo = {atomIndex=fromIdx}.atomno
    var iChain = {atomIndex=fromIdx}.chain
    select none
    while ({(atomno=iNo) and (chain=iChain)
        and thisModel and sidechain}) {
        var a = {(atomno=iNo) and (chain=iChain)and thisModel}
        a.selected = true
        iNo++
    }
}

# Resolve collisions on selection
function handle_collisions( targetIdx) {

    # For all selected atoms
    for (var iNo = {selected}.min.atomno; iNo <= {selected}.max.atomno; iNo++) {
        var idx = {(atomno=iNo) and (chain=gchain)
            and thisModel}.atomIndex
        if ({atomindex=idx}.selected) {

            # Collect local colliders
            var lcAtoms = (within(kCtolerance, false, {atomIndex=idx})
                and not {atomIndex=idx}
                and not {gOkCollide}
                and not connected({atomIndex=idx}))
            if (lcAtoms) {
                # Ignore kinked BB
                try {
                    if (is_bb_idx(idx) and (angle(
                        {atomIndex=@{get_cward_bb_idx(idx, gChain)}}, {atomIndex=idx},
                        {atomIndex=@{get_nward_bb_idx(idx, gChain)}}) < 100.0)) {
                        continue
                    }
                }
                catch {
                }

                # For all local colliders
                for (var c = 1; c <= lcAtoms.size; c++ ) {
                    var cidx = lcAtoms[c].atomIndex

                    # If it is with water, delete it
                    if (lcAtoms[c].group = "HOH") {
                        delete {atomIndex=cidx}
                    }

                    # else if it is with side chain not proline, fix it
                    else if (is_sc_idx(cidx) and ({atomIndex=cidx}.group != "PRO")) {
                        fix_sc_collision_2(cidx)
                        
                        # If not fixed, exit fail
                        if (not gOk2) {
                            return # early exit (break n jmol bug)
                        }
                    }

                    # else if it is itself a side chain not proline, fix it
                    else if (is_sc_idx(idx) and ({atomIndex=idx}.group != "PRO")) {
                        fix_sc_collision_2(idx)

                        # If not fixed, exit fail
                        if (not gOk2) {
                            return # early exit (break n jmol bug)
                        }
                    }

                    # Else if it is with O, counter-rotate
                    else if (lcAtoms[c].atomName = "O") {
                        counter_rotate_2(lcAtoms[c].atomIndex,
                            {atomIndex=idx}.xyz, targetIdx, false)

                        # If not fixed, exit fail
                        if (not gOk2) {
                            return # early exit (break n jmol bug)
                        }
                    }

                    # Else if it is itself O, counter-rotate
                    else if ({atomIndex=idx}.atomName = "O") {
                        counter_rotate_2(idx, lcAtoms[c].xyz, targetIdx, false)

                        # If not fixed, exit fail
                        if (not gOk2) {
                            return # early exit (break n jmol bug)
                        }
                    }

                    else {    # Else not fixed, exit fail
                        gOk2 = false
                        return # early exit (break n jmol bug)
                    }
                } # endfor
            }
        }
    } # endfor iNo
}

# Rotate rotor set to move target atom to its proper place
function tug_track_idx(targetIdx, targetPt, nWard, cDetect) {
    gOK = false
    var pt = targetPt
    var dist = distance(pt, {atomIndex=targetIdx}.xyz)

    var rotors = (nWard ? gNrotors : gCrotors)

    # For a number of passes
    for (var pass1 = 0; pass1 < 20; pass1++) {
        var blocked = ({})
        for (var pass2 = 0; pass2 < (rotors.size/4); pass2++) {

            var v1 = {atomIndex=targetIdx}.xyz - pt

            # Find the most orthgonal unused rotor
            var imax = 0
            var smax = 0.5
            for (var i = 1; i < rotors.size; i += 4) {
                var i2 = rotors[i+1]
                var i3 = rotors[i+2]
                var i4 = rotors[i+3]
                if ((i2 != targetIdx) and (i3 != targetIdx) and (i4 != targetIdx)) {
                    if ({blocked and {atomIndex=i2}}.count == 0) {
                        var v2 = {atomIndex=i3}.xyz - {atomIndex=i2}.xyz

                        var s = sin(abs(angle(v1, {0 0 0}, v2)))
                        if (s > smax) {
                            smax = s
                            imax = i
                        }
                    }
                }
            }

            # If no more rotors, break to next full try
            if (imax == 0) {
               break
            }
            var i1 = rotors[imax+0]
            var i2 = rotors[imax+1]
            var i3 = rotors[imax+2]
            var i4 = rotors[imax+3]

            # Get dihedral of rotor with target point
            var dt = angle({atomIndex=targetIdx}, {atomIndex=i2}, {atomIndex=i3}, pt)
            var dh = angle({atomIndex=i1}, {atomIndex=i2}, {atomIndex=i3}, {atomIndex=i4})
            if (abs(dh).type == "string") {
                dh = -50
            }
            var psi = dh + dt
            var phi = dh + dt

            # Compute resultant psi and phi
            #  and select from target atom to first half of rotor
            var movePt = false
            if (nWard) {
                if ({atomIndex=i2}.atomName="CA") {
                    psi = angle({atomIndex=@{get_cward_bb_idx(i1, gChain)}}, {atomIndex=i1},
                        {atomIndex=i2}, {atomIndex=i3}) + dt
                }
                else {
                    phi = angle({atomIndex=i1}, {atomIndex=i2},
                        {atomIndex=i3}, {atomIndex=@{get_nward_bb_idx(i3, gChain)}}) + dt
                }

                if ({atomIndex=i2}.atomno > {atomIndex=targetIdx}.atomno) {
                    movePt = true
                    select_nward_idx(i3, get_cward_bb_idx(targetIdx, gChain))
                    {atomIndex=targetIdx}.selected = true
                }
                else {
                    select_cward_idx(i2, targetIdx)
                }
            }
            else {
                if (({atomIndex=i2}.atomName="CA")) {
                    phi = angle({atomIndex=@{get_nward_bb_idx(i1, gChain)}}, {atomIndex=i1},
                        {atomIndex=i2}, {atomIndex=i3}) + dt
                }
                else {
                    psi = angle({atomIndex=i2}, {atomIndex=i3},
                        {atomIndex=i4}, {atomIndex=@{get_cward_bb_idx(i4, gChain)}}) + dt
                }

                if ({atomIndex=i2}.atomno < {atomIndex=targetIdx}.atomno) {
                    movePt = true
                    select_cward_idx(i3, get_nward_bb_idx(targetIdx, gChain))
                    {atomIndex=targetIdx}.selected = true
                }
                else {
                    select_nward_idx(i2, targetIdx)
                }
            }

            # Relax rules if desperate
            if (pass1 > 10) {
                phi = -50
            }

            # If rotation within ramachandran limits
            if ((abs(dt) >= 0.1) and
                (({atomIndex=i2}.group=="GLY") or (phi < 0))) {

                # If moving target point, put the target atom there
                var cp = {atomIndex=targetIdx}.xyz
                if (movePt) {
                    dt = -dt
                    {atomIndex=targetIdx}.xyz = pt
                }

                # Rotate to minimize vector ====================
                rotateSelected {atomIndex=i2} {atomIndex=i3} @dt

                # If collision checking
                if (cDetect) {

                    # If collision, back off by eighths
                    var wasCollision = false
                    for (var ci = 0; ci < 4; ci++) {
                        if (ci < 3) {
                            dt /= 2
                        }
                        handle_collisions( targetIdx)
                        if (not gOk2) {
                            wasCollision = true
                            rotateSelected {atomIndex=i2} {atomIndex=i3} @{-dt}
                        }
                        else if (wasCollision) {
                            if (ci <3) {
                                rotateSelected {atomIndex=i2} {atomIndex=i3} @{dt}
                            }
                        }
                        else {
                            break
                        }

                        if (dt < 0.01) {
                            break
                        }
                    } # endfor
                }

                # If moving target point, put the target atom back
                if (movePt) {
                    pt = {atomIndex=targetIdx}.xyz
                    {atomIndex=targetIdx}.xyz = cp
                }

            }

            # If close enough, stop
            if (distance(pt, {atomIndex=targetIdx}) < kDtolerance) {
                gOK = true
                gTargetPt = pt
                break
            }

            # Block rotor
            blocked |= {atomIndex=i2}

        }   # endfor num rotors passes

        if (gOK) {
            break
        }
    }   # endfor 20 passes
}

# Counter rotate bonds on either side of a BB O
function do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nWard) {

    # Rotate psi
    {atomIndex=nIdx}.selected = nWard
    {atomIndex=cIdx}.selected = nWard
    {atomIndex=oIdx}.selected = nward
    rotateSelected {atomIndex=caPsiIdx} {atomIndex=cIdx} @{dir}

    # Counter-rotate phi
    {atomIndex=nIdx}.selected = not nWard
    {atomIndex=cIdx}.selected = not nWard
    {atomIndex=oIdx}.selected = not nward
    rotateSelected {atomIndex=nIdx} {atomIndex=caPhiIdx} @{-dir}
}

function counter_rotate(oIdx, dir, nWard) {

    var iChain = {atomIndex=oIdx}.chain
    var selsave = {selected}
    var cIdx = get_sc_bb_idx(oIdx, iChain)
    var nIdx = get_cward_bb_idx(cIdx, iChain)
    var caPhiIdx = get_cward_bb_idx(nIdx, iChain)
    var caPsiIdx = get_nward_bb_idx(cIdx, iChain)

    if (nWard) {
        var nNo = {(chain=iChain) and thisModel}.atomno.min
        select_nward_idx(caPsiIdx, {(atomno=nNo) and (chain=iChain)
            and thisModel}.atomIndex)
    }
    else {
        var cNo = {(chain=iChain) and thisModel}.atomno.max
        select_cward_idx(caPhiIdx, {(atomno=cNo) and (chain=iChain)
            and thisModel}.atomIndex)
    }

    # Counter-rotate
    do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, not nWard)
    select selsave
}

function counter_rotate_2(oIdx, toPt, terminalIdx, oDrag) {

    var iChain = {atomIndex=oIdx}.chain
    var selsave = {selected}
    var gOk2 = true
    var cIdx = get_sc_bb_idx(oIdx, iChain)
    var nIdx = get_cward_bb_idx(cIdx, iChain)
    var caPhiIdx = get_cward_bb_idx(nIdx, iChain)
    var caPsiIdx = get_nward_bb_idx(cIdx, iChain)

    var nTward = ({atomIndex=oIdx}.atomno < {atomIndex=terminalIdx}.atomno)
    if (nTward) {
        select_cward_idx(cIdx, terminalIdx)
    }
    else {
        select_nward_idx(nIdx, terminalIdx)
    }

    # Until all collisions cancelled
    var dir = 5
    var ang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})
    var tcount = 0
    while (oDrag or (within(kCtolerance, false, {atomIndex=oIdx})
            and not {atomIndex=oIdx} and not connected({atomIndex=oIdx})
            and not {gOkCollide} > 0)) {

        # Counter-rotate
        do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nTward)
        var newang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})

        # If wrong direction once, undo and reverse
        if (newang > ang) {
            do_counter_rotate(caPhiIDx, nIdx, cIdx, oIdx, caPsiIdx, -dir, nTward)

            # If first time, continue in opposite direction
            dir *= -1
            if (dir < 0) {
                continue
            }
        }

        if (oDrag) {
            break
        }

        # If no go, undo and exit
        tcount++
        if (tcount > (360/abs(dir))) {
            gOk2 = false
            break
        }

    } # endwhile
    select selsave
}

# Repair proline
function repair_proline(BBidx) {
    var cbidx = get_cb_idx(BBidx)
    var cbno = {atomIndex=cbidx}.atomno
    var cgidx = {(atomno=@{cbno+1}) and (chain=gChain)
        and thisModel}.atomIndex
    var cdidx = {(atomno=@{cbno+2}) and (chain=gChain)
        and thisModel}.atomIndex
    var caidx = {(atomno=@{cbno-3}) and (chain=gChain)
        and thisModel}.atomIndex
    var nidx = {(atomno=@{cbno-4}) and (chain=gChain)
        and thisModel}.atomIndex

    select {atomIndex=cbidx}
    set_angle_idx(nidx, caidx, cbidx, 109.5)

    select {atomIndex=cdidx}
    set_distance_idx(nidx, cdidx, 1.47)
    set_angle_idx(caidx, nidx, cdidx, 102.7)
    set_dihedral_idx(cbidx, caidx, nidx, cdidx, 16.2)

    select {atomIndex=cgidx}
    set_distance_idx(cdidx, cgidx, 1.51)
    set_angle_idx(nidx, cdidx, cgidx, 106.4)
    set_dihedral_idx(caidx, nidx, cdidx, cgidx, 16.2)
}

# Repair side chain
function repair_sc(targetIdx, nWard) {

    var idx = (nWard ? get_cward_bb_idx(targetIdx, gChain) : get_nward_bb_idx(targetIdx, gChain))

    if (({atomIndex=targetIdx}.atomName == "CA")
        and ({atomIndex=targetIdx}.group != "GLY")) {
        var cbidx = get_cb_idx(targetIdx)
        select none
        select_add_sc(cbidx)
        set_angle_idx(idx, targetIdx, cbidx, 110.0)
        set_distance_idx(targetIdx, cbidx, 1.5)
        if ({atomIndex=targetIdx}.group != "PRO") {
            var colliders = (within(kCtolerance, false, {selected})
                and not {atomIndex=targetIdx} and not {selected})
            if (colliders) {
                if ({atomIndex=targetIdx}.group != "ALA") {
                    fix_sc_collision_2(cbidx)
                }
            }
        }
        else {
            if (nWard) {
            }
            else {
                set_dihedral_idx(get_nward_bb_idx(idx, gChain), idx, targetIdx, cbidx, 174.2)
            }
        }
    }

    else if ({atomIndex=targetIdx}.atomName == "C") {
        var oidx = get_o_idx(targetIdx)
        select {atomIndex=oidx}
        set_angle_idx(idx, targetIdx, oidx, 120.0)
        set_distance_idx(targetIdx, oidx, 1.21)
        if (nWard) {
            set_dihedral_idx(get_cward_bb_idx(idx, gChain), idx, targetIdx, oidx, 0.0)
        }
        if ({atomIndex=idx}.group == "PRO") {
            repair_proline(idx)
            var dNo = {atomIndex=targetIdx}.atomno + 4
            var dIdx = {(atomno=dNO) and (chain=gChain)
                and thisModel}.atomIndex
            var colliders = (within(kCtolerance, false, {atomIndex=dIdx})
                and not connected({atomIndex=dIdx})
                and not {atomIndex=dIdx})
            for (var i = 1; i <= colliders.size; i++) {
                if (colliders[i].atomName == "O") {
                    counter_rotate_2(colliders[i].atomIndex,
                        {atomIndex=dIdx}.xyz, targetIdx, false)
                }
            }
        }
    }
}

# Rebuild Cward rotors set
function tug_track_c() {

    # For all bb atoms cWard of cargo
    var targetIdx = gCcargoIdx
    var okCount = 0

    # Allow collisions with cargo
    gOkCollide = gCargoSet
    var tcount = 0
    while (targetIdx != gNanchorIdx) {

        # Step to next atom
        targetIdx = get_cward_bb_idx(targetIdx, gChain)
        if (targetIdx < 0) {
            break
        }

        # No collision with cargo allowed after two atoms placed
        if (tcount == 2) {
           gOkCollide = ({})
        }
        tcount++

        # Compute targets desired coords
        try {
            var c1idx = get_cward_bb_idx(targetIdx, gChain)
            var n1idx = get_nward_bb_idx(targetIdx, gChain )
            var n2idx = get_nward_bb_idx(n1Idx, gChain)
            var n3idx = get_nward_bb_idx(n2Idx, gChain)
            var pt = {0 0 0}
            if ({atomIndex=targetIdx}.atomName == "N") {
                var oidx = get_o_idx(n1idx)
                select {atomIndex=oidx}
    
                # Desired target location is trigonal O
                set_distance_idx(n1idx, oidx, 1.5)
                pt = get_trigonal_idx(n2idx, n1idx, oidx, 1.37)
                set_distance_idx(n1idx, oidx, 1.21)
            }
            else if (({atomIndex=targetIdx}.atomName == "C")
                and ({atomIndex=targetIdx}.group != "GLY")) {
    
                # Desired target location is tetragonal CB
                var cbidx = get_cb_idx(n1idx)
                pt = get_tet_idx(n2idx, n1idx, cbidx, 1.5)
            }
            else { # CA (or GLY C)
    
                # Save current target coords
                var cp = {atomIndex=targetIdx}.xyz
    
                # Set target atom at desired distance and angle
                select {atomIndex=targetIdx}
                set_distance_idx(n1idx, targetIdx, 1.5)
                set_angle_idx(n2idx, n1idx, targetIdx, 120.0)
                if ({atomIndex=targetIdx}.atomName == "CA") {
                    set_dihedral_idx(n3idx, n2idx, n1idx, targetIdx, 180)
                }
    
                # Record and restore target
                pt = {atomIndex=targetIdx}.xyz
                {atomIndex=targetIdx}.xyz = cp
            }
    
            # If target not at desired location
            if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
                okCount = 0
                gTargetPt = pt
                var xcount = 0
                gOK = false
                while ((xcount < 20) and (not gOK)) {
    
                    # Rotate on cWard rotor set to move it there
                    tug_track_idx(targetIdx, pt, false, false)
                    xcount++
                }
            }
            else {
                gOK = true
                okCount++
            }
        }
        catch {
        }

        # If successful
        if (gOK == true) {

            # Adust any side atoms
            repair_sc(targetIdx, false)
        }

        # Else fail
        else {
            break
        }

        # If no movement in 4 tries, we are done
        if (okCount > 3) {
            break
        }
    } # endwhile (targetIdx != gCanchorIdx) {
}

# Rebuild Nward rotors set
function tug_track_n() {

    gOK = true

    # For all bb atoms nWard of cargo
    var targetIdx = gNcargoIdx
    var okCount = 0

    # Allow collisions with cargo
    gOkCollide = gCargoSet
    var tcount = 0
    while (targetIdx != gNanchorIdx) {

        # Step to next atom
        targetIdx = get_nward_bb_idx(targetIdx, gChain)
        if (targetIdx < 0) {
            break
        }
        
        # No collision with cargo allowed after two atoms placed
        if (tcount == 2) {
           gOkCollide = ({})
        }
        tcount++

        # Compute targets desired coords
        var n1idx = get_nward_bb_idx(targetIdx, gChain)
        var c1idx = get_cward_bb_idx(targetIdx, gChain)
        var c2idx = get_cward_bb_idx(c1idx, gChain)
        var c3idx = get_cward_bb_idx(c2idx, gChain)
        var pt = {0 0 0}
        if ({atomIndex=targetIdx}.atomName == "CA") {

            # Desired target location is trigonal O
            var oidx = get_o_idx(c1idx)
            select {atomIndex=oidx}
            set_distance_idx(c1idx, oidx, 1.39)
            pt = get_trigonal_idx(c2idx, c1idx, oidx, 1.41)
            set_distance_idx(c1idx, oidx, 1.21)
        }
        else if (({atomIndex=targetIdx}.atomName == "N")
            and ({atomIndex=targetIdx}.group != "GLY")) {

            # Desired target location is r-tetragonal CB
            var cbidx = get_cb_idx(c1idx)
            pt = get_tet_idx(cbidx, c1idx, c2idx, 1.5)
        }
        else { # C

            # Save current target coords
            var cp = {atomIndex=targetIdx}.xyz

            # Set target atom at desired distance and angle
            select {atomIndex=targetIdx}
            set_distance_idx(c1idx, targetIdx, 1.37)
            set_angle_idx(c2idx, c1idx, targetIdx, 110.0)

            if ({atomIndex=targetIdx}.group == "PRO") {
                set_dihedral_idx(c3idx, c2idx, c1idx, targetIdx, -57.0)
            }

            # Record and restore target
            pt = {atomIndex=targetIdx}.xyz
            {atomIndex=targetIdx}.xyz = cp
        }

        # If target not at desired location
        if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
            var okCount = 0
            gTargetPt = pt
            var xcount = 0
            gOK = false
            while ((xcount < 20) and (not gOK)) {

                # Rotate on nWard rotor set to move it there
                tug_track_idx(targetIdx, pt, true, false)
                xcount++
            }
        }
        else {
            gOK = true
            okCount++
        }

        # If sucessful
        if (gOK == true) {

            # Adust any side atoms
            repair_sc(targetIdx, true)
        }

        # Else fail
        else {
            break
        }

        # If no movement in 4 tries, we are done
        if (okCount > 3) {
            break
        }

    }   # endwhile (targetIdx != gNanchorIdx) {
}

# gPlicoRecord is maintained by the macro pilcoRecord
function translate_selected_record(pt) {
    if (gPlicoRecord != "") {
        plico_record(format("select %s;translateSelected %s;", {selected}, pt))
    }
    translateSelected @pt
}

# gPlicoRecord is maintained by the macro pilcoRecord
function rotate_selected_record(pivotIdx, caxis, a) {
    if (gPlicoRecord != "") {
        plico_record(format("select %s;", {selected}))
        plico_record(format("rotateSelected {atomIndex=%d} @%s @%s;",
            pivotIdx, caxis, a))
    }
    rotateSelected {atomIndex=pivotIdx} @caxis @a
}

function collect_sc_rotors(no, iChain) {
    var scBondIdxs = array()
    for (var iNo = no; iNo >= 0; iNo--) {
        var ile = 0
        switch ({(atomno=iNo) and (chain=iChain)
            and thisModel}.atomName) {
        case "CA" :
            return scBondIdxs # Early exit since break 1 appears broken
        case "CZ" :
            if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.group == "TYR") {
                break
            }
        case "CE" :
            if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.group == "MET") {
                break
            }
        case "CG1" :
            if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.group == "VAL") {
                break
            }
            if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.group == "ILE") {
                ile = 1
            }
        case "NE" :
        case "CD" :
        case "SD" :
        case "CG" :
        case "CB" :
            scBondIdxs += {(atomno=@{iNo+1+ile}) and (chain=iChain)
                and thisModel}.atomIndex
            scBondIdxs += {(atomno=@{iNo+0}) and (chain=iChain)
                and thisModel}.atomIndex
            if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.atomName%2 == "CG") {
                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)
                    and thisModel}.atomIndex
                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)
                    and thisModel}.atomIndex
            }
            else if ({(atomno=iNo) and (chain=iChain)
                and thisModel}.atomName == "CB") {
                scBondIdxs += {(atomno=@{iNo-3}) and (chain=iChain)
                    and thisModel}.atomIndex
                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)
                    and thisModel}.atomIndex
            }
            else {
                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)
                    and thisModel}.atomIndex
                scBondIdxs += {(atomno=@{iNo-2}) and (chain=iChain)
                    and thisModel}.atomIndex
            }
            break
        }

    }

    return scBondIdxs
}

# Drag Side Chain
function drag_sc() {
    var iNo = {atomIndex=gSCidx}.atomno
    var iChain  = {atomIndex=gSCidx}.chain
    if ({atomIndex=gSCidx}.group != "PRO") {

        var scBondIdxs = collect_sc_rotors( iNo, iChain)
        var numChi = scBondIdxs.size / 4
        var dist = distance({atomIndex=gSCidx}.xyz, gSCpt)
        var scSet = get_sc_set(gSCidx, iChain)

        # For all rotor combinations
        var dh = array()
        for (var i = 0; i < numChi; i++) {
            dh += angle({atomIndex=@{scBondIdxs[4+(4*i)]}},
                {atomIndex=@{scBondIdxs[3+(4*i)]}},
                {atomIndex=@{scBondIdxs[2+(4*i)]}},
                {atomIndex=@{scBondIdxs[1+(4*i)]}})
        }
        for (var i = 0; i < numChi; i++) {
            var rot = -120
            for (var j = 0; j < 6; j++) {
                rot += 60*j
                select_add_sc(scBondIdxs[1+(4*i)])
                set_dihedral_idx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
                    scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], rot)
                var newDist = distance({atomIndex=gSCidx}.xyz, gSCpt)
                if (gSCcheck) {
                    var colliders = (within(kCtolerance, false, scSet)
                        and not connected(scSet) and not {scSet})
                    if (colliders) {
                        continue
                    }
                }

                # Find the best
                if (newDist < dist) {
                    dist = newDist
                    for (var k = 0; k < numChi; k++) {
                        dh[k+1] = angle({atomIndex=@{scBondIdxs[4+(4*k)]}},
                        {atomIndex=@{scBondIdxs[3+(4*k)]}},
                        {atomIndex=@{scBondIdxs[2+(4*k)]}},
                        {atomIndex=@{scBondIdxs[1+(4*k)]}})
                    }
                }
            }
        }

        # Now set the best
        for (var i = 0; i < numChi; i++) {
            select_add_sc(scBondIdxs[1+(4*i)])
            set_dihedral_idx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
                scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], dh[i+1])
        }
        
        if (gSCcheck = false) {
            plico_minimize( scSet)
        }
    }
    else { # PRO - toggle between puckers up and down
        var icd = {(atomno=@{iNo+1}) and (chain=iChain)
            and thisModel}.atomIndex
        var icb = {(atomno=@{iNo-1}) and (chain=iChain)
            and thisModel}.atomIndex
        var ica = {(atomno=@{iNo-4}) and (chain=iChain)
            and thisModel}.atomIndex
        var in = {(atomno=@{iNo-5}) and (chain=iChain)
            and thisModel}.atomIndex
        select {atomIndex=gSCidx}

        if (angle({atomIndex=ica}, {atomIndex=in},
            {atomIndex=icd}, {atomIndex=gSCidx}) < -10.0) {
            set_dihedral_idx(ica, in, icd, gSCidx, 8.7)
            set_angle_idx(in, icd, gSCidx, 110.0)
            set_distance_idx(icd, gSCidx, 1.5)
        }
        else {
            set_dihedral_idx(ica, in, icd, gSCidx, -29.5)
            set_angle_idx(in, icd, gSCidx, 108.8)
            set_distance_idx(icd, gSCidx, 1.5)
        }
    }

    draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
    gSCpt = {atomIndex=gSCidx}.xyz
}

# Fix side chain collisions
function fix_sc_collision_2(idx) {
    gOk2 = false
    var iNo = {atomIndex=idx}.atomno
    var iChain = {atomIndex=idx}.chain
    var resno = {(atomno=iNo) and (chain=iChain)
        and thisModel}.resno

    # Get SC terminus
    while (resno == {(atomno=iNo) and (chain=iChain)
        and thisModel}.resno) {
        iNo++
    }
    iNo--

    var sc = array()
    var iBno = iNo
    while ({(atomno=iBno) and (chain=iChain)
        and thisModel}.atomName != "CB") {
        sc += {(atomno=iBno) and (chain=iChain)
            and thisModel}
        iBno--
    }
    var cbidx = {(atomno=iBno) and (chain=iChain)
        and thisModel}.atomIndex

    var scBondIdxs = collect_sc_rotors( iNo, iChain)
    var numChi = scBondIdxs.size / 4

    # For all rotor combinations
    for (var i = 0; i < numChi; i++) {
        var rot = -120
        for (var j = 0; j < 6; j++) {
            rot += 60
            select_add_sc(scBondIdxs[1+(4*i)])
            set_dihedral_idx(scBondIdxs[1+(4*i)], scBondIdxs[2+(4*i)],
                scBondIdxs[3+(4*i)], scBondIdxs[4+(4*i)], rot)

            # If no collision, exit
            var colliders = (within(kCtolerance, false, {sc})
                and not {atomIndex=cbidx} and not {sc})

            # If it is with water, delete the water
            for (var c = 1; c < colliders.size; c++ ) {
                if (colliders[c].group = "HOH") {
                    delete {atomIndex=@{colliders[c].atomIndex}}
                    colliders = {colliders and not @{colliders[c]}}
                }
            }

            if (colliders.size == 0) {
                gOk2 = true
                return # Early exit since break 1 appears broken
            }

        }
    }
}

function is_moveable_sc(aIdx) {

    var ret = (({atomIndex=aIdx}.group != "PRO")
        or ({atomIndex=aIdx}.atomName == "CG"))
    switch({atomIndex=aIdx}.atomName) {
    case "N":
    case "CA":
    case "C":
    case "CB":
    case "O":
    case "O4\'":
        ret = false
        break
    }
    return ret
}

function is_rotor_avail(i1idx, i2idx) {
    var ret = true
    if (i1idx > i2idx) { # frozen bonds are kept as lo-hi
        var idx = @i1idx
        i1idx = @i2idx
        i2idx = @idx
    }

    for (var i = 1; i <= gFreeze.size; i += 2) {
        if ((gFreeze[i] == i1idx) and (gFreeze[i+1] == i2idx)) {
            ret = false
            break
        }
    }

    return ret
}

function xcollect_bb_rotors(nWard) {
    var anchorNo = (nWard
        ? ((gNanchorIdx >= 0) ? {atomIndex=gNanchorIdx}.atomno : gMinNo)
        : ((gCanchorIdx >= 0) ? {atomIndex=gCanchorIdx}.atomno : gMaxNo))
    var cargoNo = (nWard
        ? ((gNcargoIdx >= 0) ? {atomIndex=gNcargoIdx}.atomno
        : {atomIndex=gCcargoIdx}.atomno)
        : {atomIndex=gCcargoIdx}.atomno)
    var rotors = array()
    if (cargoNo < anchorNo) {

        for (var iNo = cargoNo; iNo <= anchorNo; iNo++) {
            if ({(atomno=iNo) and (chain=gChain)
                and thisModel}.atomName == "CA") {
                if (is_rotor_avail(iNo)) {# xxx
                    if (({(atomno=iNo) and (chain=gChain)
                        and thisModel}.group != "PRO") and (iNo > cargoNo)) { # phi
                        rotors += [{(atomno=@{get_cm_no(iNo-1)}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo-1}) and (chain=gChain)
                                and thisModel}.atomIndex]
                        rotors += [{(atomno=@{iNo}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo+1}) and (chain=gChain)
                                and thisModel}.atomIndex]
                    }
                    if (iNo != (anchorNo-1)) { # psi
                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo}) and (chain=gChain)
                                and thisModel}.atomIndex]
                        rotors += [{(atomno=@{iNo+1}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{get_np_no(iNo+2)}) and (chain=gChain)
                                and thisModel}.atomIndex]
                    }
                }
            }
        }
    }
    else {

        for (var iNo = cargoNo; iNo >= anchorNo; iNo--) {
            if ({(atomno=iNo) and (chain=gChain)
                and thisModel}.atomName == "CA") {
                if (is_rotor_avail(iNo)) {
                    if ((iNo != (anchorNo-1)) and (iNo < cargoNo)) { # psi
                        rotors += [{(atomno=@{get_np_no(iNo+2)}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo+1}) and (chain=gChain)
                                and thisModel}.atomIndex]
                        rotors += [{(atomno=@{iNo}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo-1}) and (chain=gChain)
                                and thisModel}.atomIndex]
                    }
                    if ({(atomno=iNo) and (chain=gChain)
                        and thisModel}.group != "PRO") { # phi
                        rotors += [{(atomno=@{iNo+1}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{iNo}) and (chain=gChain)
                                and thisModel}.atomIndex]
                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)
                            and thisModel}.atomIndex,
                            {(atomno=@{get_cm_no(iNo-1)}) and (chain=gChain)
                                and thisModel}.atomIndex]
                    }
                }
            }
        }
    }

    if (nWard) {
        gNrotors = rotors
    }
    else {
        gCrotors = rotors
    }
}
function collect_bb_rotors(nWard) {
    if (nWard) {
        gNrotors = array()
        var nres = {atomIndex=gNcargoIdx}.resno
        var nname = {atomIndex=gNcargoIdx}.atomName
        var ares = get_resno_min(gChain)
        var aA = get_atom_rcn( ares, gChain, "N")
        if (gNanchorIdx >= 0) {
            aA = {atomIndex=gNanchorIdx}
        }
        var aname = aA.atomName
        for (var r = nres; r >= ares; r--) {
            var aCp = get_atom_rcn( r-1, gChain, "C")
            var aN = get_atom_rcn( r, gChain, "N")
            var aCa = get_atom_rcn( r, gChain, "CA")
            var aC = get_atom_rcn( r, gChain, "C")
            var aNn = get_atom_rcn( r+1, gChain, "N")
            if (aCp.size < 1) {
                aCp = aNn
            }
            # psi
            if (((r < nres) and (r > ares))
                or ((r == nres) and (nname == "C"))
                or ((r == ares) and (aname != "C"))) {
                if (is_rotor_avail(aCa.atomIndex, aC.atomIndex)) {
                    gNrotors += aNn.atomIndex
                    gNrotors += aC.atomIndex
                    gNrotors += aCa.atomIndex
                    gNrotors += aN.atomIndex
                }
            }
                        
            # phi
            if (aCa.group != "PRO") {
                if (((r <= nres) and (r > ares))
                    or ((r == ares) and (aname == "N"))) {
                    if (is_rotor_avail(aCa.atomIndex, aN.atomIndex)) {
                        gNrotors += aC.atomIndex
                        gNrotors += aCa.atomIndex
                        gNrotors += aN.atomIndex
                        gNrotors += aCp.atomIndex
                    }
                }
            }
        } # endfor
    }
    else {
        gCrotors = array()
        var cres = {atomIndex=gCcargoIdx}.resno
        var cname = {atomIndex=gCcargoIdx}.atomName
        var ares = get_resno_max(gChain)
        var aA = get_atom_rcn( ares, gChain, "C")
        if (gCanchorIdx >= 0) {
            aA = {atomIndex=gCanchorIdx}
        }
        var aname = aA.atomName
        for (var r = cres; r <= ares; r++) {
            var aCp = get_atom_rcn( r-1, gChain, "C")
            var aN = get_atom_rcn( r, gChain, "N")
            var aCa = get_atom_rcn( r, gChain, "CA")
            var aC = get_atom_rcn( r, gChain, "C")
            var aNn = get_atom_rcn( r+1, gChain, "N")
            if (aNn.size < 1) {
                aNn = aCp
            }
            
            # phi
            if (aCa.group != "PRO") {
                if (((r > cres) and (r < ares))
                    or ((r == cres) and (aname == "N"))
                    or ((r == ares) and (aname != "N"))) {
                    if (is_rotor_avail(aN.atomIndex, aCa.atomIndex)) {
                        gCrotors += aCp.atomIndex
                        gCrotors += aN.atomIndex
                        gCrotors += aCa.atomIndex
                        gCrotors += aC.atomIndex
                    }
                }
            }
            
            # psi
            if (((r >= cres) and (r < ares))
                or ((r == cres) and (aname != "C"))
                or ((r == ares) and (aname == "C"))) {
                if (is_rotor_avail(aCa.atomIndex, aC.atomIndex)) {
                    gCrotors += aN.atomIndex
                    gCrotors += aCa.atomIndex
                    gCrotors += aC.atomIndex
                    gCrotors += aNn.atomIndex
                }
            }
        } # endfor
    }
}

function collect_rotors() {
    collect_bb_rotors(false)
    collect_bb_rotors(true)
}

function tug_sc(pt) {

    # If destination atom defined
    if (gDestAtomIdx >= 0) {
        var v = {atomIndex=gDestAtomIdx}.xyz - {atomIndex=gSCidx}.xyz
        if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
            pt = -v/20.0
        }
        else {
            pt = v/20.0
        }
    }
    gSCpt += pt
    draw arrow {atomIndex=gSCidx} @gSCpt
}

function set_colors() {
    select (thisModel)
    color {selected} @gScheme
    color {atomIndex=g1pivotIdx} green
    color {atomIndex=g2pivotIdx} green
    color @gCargoSet @gAltScheme
    color {gCargoSet and oxygen} pink
    select {(atomIndex=gCcargoIdx) or (atomIndex=gNcargoIdx)
        or (atomIndex=gCanchorIdx) or (atomIndex=gNanchorIdx)}
    halo on
    select {atomIndex=gDestAtomIdx}
    star on
    select none
}

function clear_atom_idxs() {
    gCcargoIdx = -1
    gNcargoIdx = -1
    gCanchorIdx = -1
    gNanchorIdx = -1
    g1pivotIdx = -1
    g2pivotIdx = -1
    g1dynamicIdx = -1
    g2dynamicIdx = -1
    gDestAtomIdx = -1
    gSCidx = -1
}

function timed_out (s) {
    timeout ID"tug" OFF
    refresh
    if (prompt(format("%s - Undo?", s), "Yes|No", true) == "Yes") {
        gBusy = false
        restore state gState
        connect
        select gCargoSet
        set bondPicking true
        refresh
        for (var i = 1; i <= gFreeze.size; i+=2) {
            select {atomIndex=@{gFreeze[i]}} or {atomIndex=@{gFreeze[i+1]}}
            color bonds lightblue
        }
        background ECHO yellow
        echo @gEcho
        select all
        quit
    }
}

function record_drag() {
    var ls = format("select %s;", {selected})
    ls += format("gCanchorIdx = %d;", gCanchorIdx)
    ls += format("gCanchorNo = %d;", gCanchorNo)
    ls += format("gNanchorIdx = %d;", gNanchorIdx)
    ls += format("gNanchorNo = %d;", gNanchorNo)
    ls += format("gCcargoIdx = %d;", gCcargoIdx)
    ls += format("gNcargoIdx = %d;", gNcargoIdx)
    ls += format("gCcargoNo = %d;", gCcargoNo)
    ls += format("gNcargoNo = %d;", gNcargoNo)
    ls += format("gDestAtomIdx = %d;", gDestAtomIdx)
    ls += format("g1pivotIdx = %d;", g1pivotIdx)
    ls += format("g2pivotIdx = %d;", g2pivotIdx)
    ls += format("gOkCollide = %s;", gOkCollide)
    ls += format("gChain = \"%s\";", gChain)
    ls += format("gMinNo = %d;", gMinNo)
    ls += format("gMaxNo = %d;", gMaxNo)
    ls += format("gCargoSet = %s;", gCargoSet)
    ls += format("gSCidx = %d;", gSCidx)
    ls += format("gSCcircle = %d;", gSCcircle)
    ls += format("gSCpt = %s;", gSCpt)
    ls += "collect_rotors();"
    ls += "tug_drag_done_mb();"
    plico_record(ls)
}

# Pick call-back for freeze
function tug_pick_cb() {
    if (_pickInfo[3][6] == "bond") {
        var sel = {selected}
        var i = _pickInfo.find(":")
        var iChain = _pickInfo[i+1]
        i = _pickInfo.find("#")
        var a1no = 0 + _pickInfo[i+1][i+3]
        var j = _pickInfo[i+1][9999].find("#")
        var a2no = 0 + _pickInfo[i+j+1][i+j+3]
        var i1idx = {(atomno=a1no) and (chain=iChain)
            and thisModel}.atomIndex
        var i2idx = {(atomno=a2no) and (chain=iChain)
            and thisModel}.atomIndex
        if (({atomIndex=i1idx}.atomName == "CA")
            or ({atomIndex=i2idx}.atomName == "CA")) {
            if (({atomIndex=i1idx}.atomName != "CB")
                and ({atomIndex=i2idx}.atomName != "CB")) {
                if (i1idx > i2idx) {
                    var idx = 0 + i1idx
                    i1idx = 0 + i2idx
                    i2idx = 0 + idx
                }
                select {atomIndex=i1idx} or {atomIndex=i2idx}

                for (i = 1; i <= gFreeze.size; i += 2) {
                    if ((gFreeze[i] == i1idx) and (gFreeze[i+1] == i2idx)) {
                        if (i > 1) {
                            if (gFreeze.size = (i+1)) {
                                gFreeze = gFreeze[1][i-1]
                            }
                            else {
                                gFreeze = gFreeze[1][i-1] + gFreeze[i+2][0]
                            }
                        }
                        else {
                            gFreeze = gFreeze[i+2][0]
                        }
                        color bonds NONE
                        i = 0
                        break
                    }
                }
                if (i > gFreeze.size) {
                    gFreeze += i1idx
                    gFreeze += i2idx
                    color bonds lightblue
                }
            }
        }
        select {sel}
    }
}

# Bound to LEFT-UP by tug_enable_drag
function tug_drag_done_mb() {
    if (not gBusy) {
        if (gPlicoRecord != "") {
            record_drag()
        }

        # Move by rotation on rotor sets, smallest first
        gBusy = true
        background ECHO pink
        refresh

        # If side chain mode
        if (gSCidx >= 0) {
            drag_sc()
        }

        # Else
        else if (not gTow) {
            gOK = true
            timeout ID"tug" 20.0 "timed_out(\"Tug timed out\")"
            if ((gCrotors.size < gNrotors.size) or (gNanchorIdx < 0)) {
                if (gCrotors.size > 4) {
                    tug_track_c()
                }
                if (gOK and (gNrotors.size > 4)) {
                    tug_track_n()
                }
            }
            else {
                if (gNrotors.size > 4) {
                    tug_track_n()
                }
                if (gOK and (gCrotors.size > 4)) {
                    tug_track_c()
                }
            }
            timeout ID"tug" OFF

            # If anchor angles acute, fail
            if (gOK == true) {
                if (gCanchorIdx >= 0) {
                    var ic = get_cward_bb_idx(gCanchorIdx, gChain)
                    var in = get_nward_bb_idx(gCanchorIdx, gChain)
                    if ((ic >= 0) and
                        angle({atomIndex=ic}, {atomIndex=gCanchorIdx}, {atomIndex=in})
                        < 100.0) {
                        gOK = false
                    }
                }
                if (gNanchorIdx >= 0) {
                    var ic = get_cward_bb_idx(gNanchorIdx, gChain)
                    var in = get_nward_bb_idx(gNanchorIdx, gChain)
                    if ((in >= 0) and
                        angle({atomIndex=ic}, {atomIndex=gNanchorIdx}, {atomIndex=in})
                        < 100.0) {
                        gOK = false
                    }
                }
            }

            # If too far
            if (not gOK) {
                timed_out("TUG TOO FAR!")
            }

            # Else OK
            else {

                var idx = {
                    (atomno=@{{(chain=gChain) and thisModel}.atomno.min})
                    and (chain=gChain) and thisModel}.atomIndex


                var ihc = 0
                for (ihc = 0; ihc < 10; ihc++) {
                    select ((atomno >= gNanchorNo) and (atomno <= gCanchorNo)
                        and (chain = gChain) and thisModel)
                    handle_collisions( idx)
                    if (count_collisions(({})).size == 0) {
                        break
                    }
                }
                if (ihc == 10) {
                    timed_out("Unable to handle all collisions!")
                }
            }
        }
        select {gCargoSet}
        gBusy = false
        background ECHO yellow
        set bondPicking true
        refresh
    }
}

# Bound to ALT-SHIFT-LEFT-DRAG by tug_enable_drag
function tug_drag_2_mb() {
    tug_drag_mb(true)
}

# Bound to ALT-LEFT-DRAG by tug_enable_drag
function tug_drag_mb(alt) {
    if (not gBusy) {
        gBusy = true
        var dx = (40.0 * (_mouseX - gMouseX))/_width
        var dy = (40.0 * (_mouseY - gMouseY))/_height
        var q = quaternion()
        var ptd = {@dx @dy 0}
        var pt = (!q)%ptd
        var caxis = {0 0 0}
        if (distance(pt,  {0 0 0}) > 0.004) {
            # If sidechain mode
            if (gSCidx >= 0) {
                if ({atomIndex=gSCidx}.atomName == "O") {
                    if ({atomIndex=gSCidx}.group != "PRO") {
                        var dir = ((abs(dx) > abs(dy))
                            ? ((dx < 0) ? 10 : -10)
                            : ((dy < 0) ? 1 : -1))
                        counter_rotate(gSCidx, dir, not alt)
                    }
                }
                else {
                    gSCcheck = not alt
                    tug_sc(pt)
                }
            }

            # Else
            else {

                # If new drag
                if (gNewDrag) {
                    gNewDrag = false
                    save state gState
                }

                # If destination atom defined
                if (gDestAtomIdx >= 0) {
                    var v = {atomIndex=gDestAtomIdx}.xyz - {selected}.xyz
                    if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
                        pt = -v/20.0
                    }
                    else {
                        pt = v/20.0
                    }
                }

                # Move the cargo
                select {gCargoSet}

                # If pivots defined, rotate it
                if (g1pivotIdx >= 0) {

                    # If two pivots
                    if (g2pivotIdx >= 0) {
                        caxis = {atomIndex=g2pivotIdx}
                    }

                    # Else
                    else {
                        caxis = cross(pt, {0 0 0}) + {atomIndex=g1pivotIdx}.xyz
                    }

                    var dir = ((abs(dx) > abs(dy))
                        ? ((dx < 0) ? 2 : -2)
                        : ((dy < 0) ? 2 : -2))
                    rotate_selected_record(g1pivotIdx, caxis, dir)

                }

                # Else translate it
                else {
                    translate_selected_record(pt)
                }

                # If collisions
                var cNotSels = (within(kCtolerance, false, {selected})
                    and not {gMovingSet})
                if ((cNotSels) and (not alt)) {
                    gOk2 = true
                    for (var i = 1; i <= cNotSels.size;  i++) {

                        # If net collision vector same as move vector
                        var cSels = (within(kCtolerance, false, cNotSels[i]) and {selected})
                        for (var j = 1; j <= cSels.size;  j++) {
                            var v1 = cNotSels[i].xyz - cSels[j].xyz
                            if (abs(angle(v1, {0 0 0}, pt)) < 90) {

                                # If tow mode
                                if (gTow) {

                                    # Make a dynamic pivot
                                    if (g1pivotIdx < 0) {
                                        g1pivotIdx = cSels[j].atomIndex
                                        g1dynamicIdx = cNotSels[i].atomIndex
                                        color {atomIndex=g1pivotIdx} lightgreen
                                        set_distance_idx(cNotSels[i].atomIndex,
                                            cSels[j].atomIndex,
                                            kCtolerance + kDtolerance)
                                    }
                                    else if (g2pivotIdx < 0) {
                                        g2pivotIdx = cSels[j].atomIndex
                                        g2dynamicIdx = cNotSels[i].atomIndex
                                        color {atomIndex=g2pivotIdx} lightgreen
                                        set_distance_idx(cNotSels[i].atomIndex,
                                            cSels[j].atomIndex,
                                            kCtolerance + kDtolerance)
                                    }
                                    else {
                                        gOk2 = false
                                    }
                                }
                                else {

                                    # Try to resolve
                                    select @{cSels[j]}
                                    var idx = {(atomno=@{{(chain=gChain)
                                        and thisModel}.atomno.min})
                                        and (chain=gChain) and thisModel}.atomIndex
                                    handle_collisions( idx)
                                }
                            }
                        } # endfor
                        if (not gOk2) {
                            break
                        }
                    } # endfor

                    # If unable
                    if (not gOk2) {

                        # Back off
                        background ECHO pink
                        delay 1
                        if (g1pivotIdx >= 0) {
                            rotate_selected_record(g1pivotIdx, caxis, -a)
                        }
                        else {
                            translate_selected_record(-pt)
                        }
                        background ECHO yellow
                        set bondPicking true
                    }
                }
            }

            # If dynamic pivots
            if (g1dynamicIdx >= 0) {
                var v1 = {atomIndex=g1dynamicIdx}.xyz - {atomIndex=g1pivotIdx}.xyz
                if (abs(angle(v1, {0 0 0}, pt)) > 90) {
                    color {atomIndex=g1pivotIdx} @gAltScheme
                    g1pivotIdx = -1
                    g1dynamicIdx = -1

                }
            }
            if (g2dynamicIdx >= 0) {
                var v1 = {atomIndex=g2dynamicIdx}.xyz - {atomIndex=g2pivotIdx}.xyz
                if (abs(angle(v1, {0 0 0}, pt)) > 90) {
                    color {atomIndex=g2pivotIdx} @gAltScheme
                    g2pivotIdx = -1
                    g2dynamicIdx = -1
                }
            }

            gMouseX = _mouseX
            gMouseY = _mouseY
        }
        select {gCargoSet}
        gBusy = false
    }
}

# Bound to ALT-LEFT-DOWN by tug_enable_drag
function tug_mark_mb() {
    gMouseX = _mouseX
    gMouseY = _mouseY
    gNewDrag = true
}

# Called by tug_cargo_mb
function tug_enable_drag() {
    gEcho = "__________TUG__________|ALT-CLICK=mark block|SHIFT-CLICK=anchors" +
        "|ALT-CTRL-CLICK=pivots|ALT-SHIFT-CLICK=dest atom|ALT-DRAG=move" +
        "|ALT-SHIFT-DRAG=alt move|CLICK bond=freeze|ALT-DOUBLE-CLICK=undo" +
        "|SHIFT-DOUBLE-CLICK=exit"
    echo @gEcho

    # Allow atoms to be dragged
    bind "ALT-LEFT-DOWN" "tug_mark_mb";
    bind "ALT-LEFT-UP" "tug_drag_done_mb";
    bind "ALT-SHIFT-LEFT-DOWN" "tug_mark_mb";
    bind "ALT-LEFT-DRAG" "tug_drag_mb";
    bind "ALT-SHIFT-LEFT-DRAG" "tug_drag_2_mb";

    unbind "SHIFT-LEFT-CLICK"
    bind "SHIFT-LEFT-CLICK" "_pickAtom";
    bind "SHIFT-LEFT-CLICK" "+:tug_anchor_mb";

    bind "ALT-CTRL-LEFT-CLICK" "_pickAtom";
    bind "ALT-CTRL-LEFT-CLICK" "+:tug_pivot_mb";

    bind "ALT-SHIFT-LEFT-CLICK" "_pickAtom";
    bind "ALT-SHIFT-LEFT-CLICK" "+:tug_dest_atom_mb";
}

# Bound to SHIFT-LEFT-CLICK by tug_cargo_mb
function tug_anchor_mb() {
    if ({atomIndex=_atomPicked}.chain == gChain) {
        var aPidx = get_sc_bb_idx( _atomPicked, gChain)

        var pno = {atomIndex=aPidx}.atomno
        if (pno > {atomIndex=gCcargoIdx}.atomno) {
            select {atomIndex=gCanchorIdx}
            halo off
            if (gCanchorIdx == aPidx) {
                gCanchorIdx = -1
                gCanchorNo = gMaxNo + 1
            }
            else {
                gCanchorIdx = aPidx
                gCanchorNo = {atomIndex=gCanchorIdx}.atomno
                select {atomIndex=gCanchorIdx}
                halo on
            }
            collect_bb_rotors(false)
        }
        else if (pno < {atomIndex=gNcargoIdx}.atomno) {
            select {atomIndex=gNanchorIdx}
            halo off
            if (gNanchorIdx == aPidx) {
                gNanchorIdx = -1
                gNanchorNo = gMinNo - 1
            }
            else {
                gNanchorIdx = aPidx
                gNanchorNo = {atomIndex=gNanchorIdx}.atomno
                select {atomIndex=gNanchorIdx}
                halo on
            }
            collect_bb_rotors(true)
        }
        else {
            tow_cargo_mb()
        }

        # Get moving atoms set
        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
            and (chain=gChain) and thisModel)}
    }
    select {gCargoSet}
}

# Bound to ALT-SHIFT-LEFT-CLICK by tug_cargo_mb
function tug_dest_atom_mb() {
    var aOk = true
    if ({atomIndex=_atomPicked}.chain == gChain) {

        var pno = {atomIndex=_atomPicked}.atomno
        if ((pno <= {atomIndex=gCcargoIdx}.atomno)
            and (pno >= {atomIndex=gNcargoIdx}.atomno)) {
            aOk = false
        }
    }
    if (aOk) {
        select {atomIndex=gDestAtomIdx}
        star off
        if (gDestAtomIdx == _atomPicked) {
            gDestAtomIdx = -1
        }
        else {
            gDestAtomIdx = _atomPicked
            select {atomIndex=gDestAtomIdx}
            star on
        }
        select {gCargoSet}
    }
}

# Bound to CTRL-LEFT-CLICK by tug_cargo_mb
function tug_pivot_mb() {
    if (g1pivotIdx == _atomPicked) {
        color {atomIndex=g1pivotIdx} @gScheme
        if (g2pivotIdx >= 0) {
            g1pivotIdx = g2pivotIdx
            g2pivotIdx = -1
            g2dynamicIdx = -1
        }
        else {
            g1pivotIdx = -1
            g1dynamicIdx = -1
        }
    }
    else if (g2pivotIdx == _atomPicked) {
        color {atomIndex=g2pivotIdx} @gScheme
        g2pivotIdx = -1
        g2dynamicIdx = -1
    }
    else if (g1pivotIdx >= 0) {
        if (g2pivotIdx >= 0) {
            color {atomIndex=g2pivotIdx} @gScheme
        }

        g2pivotIdx = _atomPicked
        g2dynamicIdx = -1
        color {atomIndex=g2pivotIdx} green
    }
    else {
        g1pivotIdx = _atomPicked
        g1dynamicIdx = -1
        color {atomIndex=g1pivotIdx} green
    }
    select {gCargoSet}
}

# Bound to SHIFT-LEFT-CLICK by plico_tug
function tow_cargo_mb() {
    gTow = true
    gChain = {atomIndex=_atomPicked}.chain
    gMinNo = {(chain=gChain) and thisModel}.atomno.min
    gMaxNo = {(chain=gChain) and thisModel}.atomno.max
    gCcargoIdx = -1
    gNcargoIdx = -1
    gCanchorIdx = -1
    gCanchorNo = gMaxNo + 1
    gNanchorIdx = -1
    gNanchorNo = gMinNo - 1

    # Highlight cargo cluster
    select {(chain=gChain) and thisModel}
    gCargoSet = {selected}
    gMovingSet = {selected}
    set_colors()

    # Enable dragging
    tug_enable_drag()
    select {gCargoSet}
    halo off
    var es = gEcho.replace("anchors","mark chain")
    echo @es
    unbind "SHIFT-LEFT-CLICK"
    bind "SHIFT-LEFT-CLICK" "_pickAtom";
    bind "SHIFT-LEFT-CLICK" "+:tow_cargo_mb";
}

# Bound to ALT-LEFT-CLICK by plico_tug or called by plicotoab.toabCargoMB
function tug_cargo_mb() {

    # If O or movable side chain atom picked
    if ((({atomIndex=_atomPicked}.atomName = "O")
        and ({atomIndex=_atomPicked}.group != "PRO"))
        or (is_moveable_sc( _atomPicked))) {
        if (gSCidx >= 0) {
            draw gSCcircle DELETE
        }
        if (gSCidx == _atomPicked) {
            gSCidx = -1
        }
        else {
            gSCidx = _atomPicked
            gSCpt = {atomIndex=gSCidx}.xyz
            draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
        }
    }
    else {
        if ({atomIndex=_atomPicked}.chain != gChain) {
            if (gTow) {
                select {(chain=gChain) and thisModel}
                color {selected} @gScheme
            }
            gChain = {atomIndex=_atomPicked}.chain
            select ({atomIndex=gCcargoIdx} or {atomIndex=gNcargoIdx}
                or {atomIndex=gCanchorIdx} or {atomIndex=gNanchorIdx})
            halo off
            gCcargoIdx = -1
            gNcargoIdx = -1
            gCanchorIdx = -1
            gNanchorIdx = -1
        }
        gTow = false
        gMinNo = {(chain=gChain) and thisModel}.atomno.min
        gMaxNo = {(chain=gChain) and thisModel}.atomno.max
        if (gNanchorIdx < 0) {
            gNanchorNo = gMinNo - 1
        }
        if (gCanchorIdx < 0) {
            gCanchorNo = gMaxNo + 1
        }
        var aPidx = get_sc_bb_idx( _atomPicked, gChain)

        gSCidx = -1
        draw gSCcircle DELETE

        # If existing cWard cargo picked
        if (gCcargoIdx == aPidx) {

            # Clear the highlight
            select {atomIndex=gCcargoIdx}
            halo off

            # If nWard cargo exists, mark it as the cWard cargo
            if (gNcargoIdx != gCcargoIdx) {
                gCcargoIdx = get_cp_idx(gNcargoIdx)
                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
            }
            else {
                gCcargoIdx = -1
                gNcargoIdx = -1
            }
        }
        else if (gNcargoIdx == aPidx) {
            select {atomIndex=gNcargoIdx}
            halo off
            gNcargoIdx = get_nm_idx(gCcargoIdx)
            gNcargoNo = {atomIndex=gNcargoIdx}.atomno
        }
        else if (gCcargoIdx >= 0) {

            var no = {atomIndex=aPidx}.atomno

            # If pick is nWard of it
            if (no < {atomIndex=gCcargoIdx}.atomno) {

                # If exists, clear its highlight
                if (gNcargoIdx != gCcargoIdx) {
                    select {atomIndex=gNcargoIdx}
                    halo off
                }

                # Set new nWard cargo and highlight it
                gNcargoIdx = get_nm_idx(aPidx)
                gNcargoNo = {atomIndex=gNcargoIdx}.atomno
            }

            # Else cWard
            else {

                # Clear its old highlight
                select {atomIndex=gCcargoIdx}
                if (gNcargoIdx != gCcargoIdx) {
                    halo off
                }

                # Set new cWard cargo and highlight
                gCcargoIdx = get_cp_idx(aPidx)
                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
            }
        }

        # Else no cWard cargo
        else {

            # Set new cWard cargo and highlight
            gCcargoIdx = get_cp_idx(aPidx)
            gCcargoNo = {atomIndex=gCcargoIdx}.atomno
            gNcargoIdx = get_nm_idx(gCcargoIdx)
            gNcargoNo = {atomIndex=gNcargoIdx}.atomno
        }

        # If any anchor now inside cargo cluster, kill it
        if ({atomIndex=gCanchorIdx}.atomno <= {atomIndex=gCcargoIdx}.atomno) {
            gCanchorIdx = -1
            gCanchorNo = gMaxNo + 1
        }
        if ({atomIndex=gNanchorIdx}.atomno >= {atomIndex=gNcargoIdx}.atomno) {
            gNanchorIdx = -1
            gNanchorNo = gMinNo - 1
        }

        # Highlight cargo cluster
        select_nward_idx(gCcargoIdx, gNcargoIdx)
        gCargoSet = {selected}
        set_colors()

        # Collect the rotor sets
        collect_rotors()

        # Get moving atoms set
        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
            and (chain=gChain) and thisModel)}
    }

    # Enable dragging
    if (gToab) {
        to_ab_enable_drag()
    }
    else {
        tug_enable_drag()
    }

    select {gCargoSet}
}

function tug_undo_mb() {
    if (prompt("Undo", "Yes|No", true) == "Yes") {
        restore state gState
    }
}

# Top level of Tug
function plico_tug() {

    # Load common functions if not already
    if (kCommon < 7) {
        script $SCRIPT_PATH$plicoCommon.spt
        if (kCommon < 7) {
            prompt ("A newer version of plicoCommon.SPT is required")
            quit
        }
    }

    gPlico = "TUG"
    plico_prelim(true, true)
    
    gBondPicking = bondPicking
    set bondPicking true
    set PickCallback "jmolscript:tug_pick_cb"

    gEcho = ("_________TUG_________|ALT-CLICK=mark block|SHIFT-CLICK=mark chain" +
        "|CLICK bond=freeze|ALT-DOUBLE-CLICK=undo|SHIFT-DOUBLE-CLICK=exit")
    echo @gEcho
    gCrotors = array()
    gNrotors = array()
    clear_atom_idxs()
    gToab = false

    bind "ALT-LEFT-CLICK" "_pickAtom";
    bind "ALT-LEFT-CLICK" "+:tug_cargo_mb";
    bind "SHIFT-LEFT-CLICK" "_pickAtom";
    bind "SHIFT-LEFT-CLICK" "+:tow_cargo_mb";
    bind "ALT-LEFT-DOUBLE" "tug_undo_mb";
    bind "SHIFT-DOUBLE" "tug_exit(true)";
    bind "LEFT-CLICK" "+:plico_menu_toggle";
}

# Bound to DOUBLE by plico_tug
function tug_exit() {
    if (plico_exit()) {
        set bondPicking gBondPicking
        set PickCallback NONE
        select all
        color bonds none
        
        reset kTug
        reset gCanchorIdx  
        reset gCanchorNo   
        reset gPlico       
        reset gNanchorIdx  
        reset gNanchorNo   
        reset gCcargoIdx   
        reset gNcargoIdx   
        reset gCcargoNo    
        reset gNcargoNo    
        reset gDestAtomIdx 
        reset g1pivotIdx   
        reset g2pivotIdx   
        reset gSelSaves    
        reset gCrotors     
        reset gNrotors     
        reset gOkCollide   
        reset gChain       
        reset gMinNo       
        reset gMaxNo       
        reset gCargoSet    
        reset gMovingSet   
        reset gSCidx       
        reset gSCcircle    
        reset gSCpt        
        reset gTargetPt    
        reset gNewDrag     
        reset gTow         
        reset g1dynamicIdx 
        reset g2dynamicIdx 
        reset gSCcheck     
        reset gBondPicking 
        reset gFreeze      
        reset gToab        
        reset function "get_cp_idx"
        reset function "get_cm_no"
        reset function "get_nm_idx"
        reset function "get_np_no"
        reset function "get_cb_idx"
        reset function "get_o_idx"
        reset function "get_nward_bb_idx"
        reset function "get_cward_bb_idx"
        reset function "get_sc_set"
        reset function "get_sc_bb_idx"
        reset function "is_bb_idx"
        reset function "is_sc_idx"
        reset function "select_add_sc"
        reset function "handle_collisions"
        reset function "tug_track_idx"
        reset function "do_counter_rotate"
        reset function "counter_rotate"
        reset function "counter_rotate_2"
        reset function "repair_proline"
        reset function "repair_sc"
        reset function "tug_track_c"
        reset function "tug_track_n"
        reset function "translate_selected_record"
        reset function "rotate_selected_record"
        reset function "collect_sc_rotors"
        reset function "drag_sc"
        reset function "fix_sc_collision_2"
        reset function "is_moveable_sc"
        reset function "is_rotor_avail"
        reset function "xcollect_bb_rotors"
        reset function "collect_bb_rotors"
        reset function "collect_rotors"
        reset function "tug_sc"
        reset function "set_colors"
        reset function "clear_atom_idxs"
        reset function "timed_out"
        reset function "record_drag"
        reset function "tug_pick_cb"
        reset function "tug_drag_done_mb"
        reset function "tug_drag_2_mb"
        reset function "tug_drag_mb"
        reset function "tug_mark_mb"
        reset function "tug_anchor_mb"
        reset function "tug_enable_drag"
        reset function "tug_dest_atom_mb"
        reset function "tug_pivot_mb"
        reset function "tow_cargo_mb"
        reset function "tug_cargo_mb"
        reset function "tug_undo_mb"
        reset function "plico_tug"


    }
}

# End of TUG.SPT

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Remig

Difference between revisions of "User:Remig/plico/tug"

Latest revision as of 17:15, 12 April 2016

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@@ Line 1: / Line 1: @@
-'''Tug''' allows the user to pull or push by mouse actions to move or rotate one part of a polypeptide against the rest by rotation on its psi and phi bonds with collision detection and restriction.  It also allows the user to move an entire chain to nest against another chain.
+'''Tug''' allows the user to pull or push by mouse actions to move or rotate one part of a polypeptide against the rest by rotation on its psi and phi bonds with collision detection and restriction.  It also allows the user to move an entire chain to nest against another chain. A full description of its capabilities can be found [[User:Remig/plico/tugManual|here]].
 '''Tug''' is a member of the Plico suite of protein folding tools described in [[User:Remig/plico]] . It may be installed and accessed as a macro with the file:
 <pre>Title=PLICO Tug
-Script=script <path to your scripts folder>/tug.spt;plicotug</pre>
+Script=script <path to your scripts directory>/tug.spt;plico_tug</pre>
-saved as plicotug.macro in your .jmol/macros folder as described in [[Macro]].
+saved as plicotug.macro in your .jmol/macros directory as described in [[Macro]].
-Copy and paste the following into a text editor and save in your scripts folder as tug.spt.
+Copy and paste the following into a text editor and save in your scripts directory as tug.spt.
 <pre>#   tug - Jmol script by Ron Mignery
-#   v1.3 beta    2/13/2014 for Jmol 14
+#   v1.20 beta    4/12/2016 -axis is now a reserved word
 #
-#   Translate or rotate a stretch of a polypeptide against itself by mouse actions
+#   Translate or rotate a stretch of a polypeptide against itself
+#    or against other chains by mouse actions
 #
-var kTug = 2
+kTug = 3
-var kDtolerance = 0.2
+gCanchorIdx = -1
-var kAtolerance = 5.0
+gCanchorNo = -1
-var kCtolerance = 1.85
+gPlico = "TUG"
-var kMtolerance = 0.8
+gNanchorIdx = -1
-var gCanchorIdx = -1
+gNanchorNo = -1
-var gCanchorNo = -1
+gCcargoIdx = -1
-var gNanchorIdx = -1
+gNcargoIdx = -1
-var gNanchorNo = -1
+gCcargoNo = -1
-var gCcargoIdx = -1
+gNcargoNo = -1
-var gNcargoIdx = -1
+gDestAtomIdx = -1
-var gCcargoNo = -1
+g1pivotIdx = -1
-var gNcargoNo = -1
+g2pivotIdx = -1
-var gDestAtomIdx = -1
+gSelSaves = ({})
-var g1pivotIdx = -1
+gCrotors = array()
-var g2pivotIdx = -1
+gNrotors = array()
-var gSelSaves = ({})
+gOkCollide = ({})
-var gCrotors = array()
+gChain = ""
-var gNrotors = array()
+gMinNo = 1
-var gMouseX = 0
+gMaxNo = 9999
-var gMouseY = 0
+gCargoSet = ({})
-var gOkCollide = ({})
+gMovingSet = ({})
-var gChain = ""
+gBusy = false
-var gMinNo = 1
+gSCidx = -1
-var gMaxNo = 9999
+gSCcircle = -1
-var gScheme = "Jmol"
+gSCpt = {0 0 0}
-var gAltScheme = "Rasmol"
+gTargetPt = {0 0 0}
-var gCargoSet = ({})
+gNewDrag = false
-var gMovingSet = ({})
+gTow = false
-var gBusy = FALSE
+g1dynamicIdx = -1
-var gSCidx = -1
+g2dynamicIdx = -1
-var gSCcircle = -1
+gSCcheck = true
-var gSCpt = {0 0 0}
+gBondPicking = false
-var gOK = TRUE # global return value to work around jmol *feature*
+gFreeze = array()
-var gOk2 = TRUE # "    "
+gToab = false
-var gTargetPt = {0 0 0}
-var gNewDrag = FALSE
-var gEcho = ""
-var gZoom = ""
-var gRotate = ""
-var gTow = FALSE
-var g1dynamicIdx = -1
-var g2dynamicIdx = -1
-var gSCcheck = TRUE
-# Return L tetrahedron point if i1<i2<i3, else R point
-function getTet(i1, i2, i3, dist) {
-    var v1 = {atomIndex=i3}.xyz - {atomIndex=i2}.xyz
-    var v2 = {atomIndex=i1}.xyz - {atomIndex=i2}.xyz
-    var axis = cross(v1, v2)
-    var pma = ({atomIndex=i1}.xyz + {atomIndex=i3}.xyz)/2
-    var pmo = {atomIndex=i2}.xyz + {atomIndex=i2}.xyz - pma
-    var pt = pmo + (axis/axis)
-    var v = pt - {atomIndex=i2}.xyz
+function get_cp_idx (idx) {
-    var cdist = distance(pt, {atomIndex=i2})
+     var no = {atomIndex=idx}.atomno
-    var factor = (dist/cdist)
+     while ((no < gMaxNo) and ({(atomno=no) and (chain=gChain)
-    var lpt = v * factor
+        and thisModel}.atomName != "C")) {
+         no++
-    return lpt + {atomIndex=i2}.xyz
-}
-function getTrigonal(i1, i2, i3, dist) {
-     var v1 = {atomIndex=i1}.xyz - {atomIndex=i2}.xyz
-     var v2 = {atomIndex=i3}.xyz - {atomIndex=i2}.xyz
-    var pt = {atomIndex=i2}.xyz - (v1 + v2)
-    var v = pt - {atomIndex=i2}.xyz
-    var cdist = distance(pt, {atomIndex=i2})
-    var factor = (dist/cdist)
-    var lpt = (v * factor)
-    return lpt + {atomIndex=i2}.xyz
-}
-function abs( x) {
-    if (x < 0) {
-         x = -x
      }
-     return x
+     return ({(atomno=no) and (chain=gChain) and thisModel}.atomIndex)
 }
-function getCAmNo (iNo) {
+function get_cm_no (iNo) {
-     while ((iNo > 0) and ({(atomno=iNo) and (chain=gChain)}.atomName != "CA")) {
+     while ((iNo > 0) and ({(atomno=iNo) and (chain=gChain)
+        and thisModel}.atomName != "C")) {
          iNo--
      }
@@ Line 101: / Line 67: @@
 }
-function getCAmIdx (idx) {
+function get_nm_idx (idx) {
-     var no = {atomIndex=idx and (chain=gChain)}.atomno
+     var no = {atomIndex=idx}.atomno
-     no = getCAmNo( no)
+    while ((no > 0) and ({(atomno=no) and (chain=gChain)
-     return ({(atomno=no) and (chain=gChain)}.atomIndex)
+        and thisModel}.atomName != "N")) {
+        no--
+     }
+     return ({(atomno=no) and (chain=gChain) and thisModel}.atomIndex)
 }
-function getCApNo (iNo) {
+function get_np_no (iNo) {
-     while ((iNo < gMaxNo) and ({(atomno=iNo) and (chain=gChain)}.atomName != "CA")) {
+     while ((iNo < gMaxNo) and ({(atomno=iNo) and (chain=gChain)
+        and thisModel}.atomName != "N")) {
          iNo++
      }
@@ Line 114: / Line 84: @@
 }
-function getCpIdx (idx) {
+function get_cb_idx (BBidx) {
-     var no = {atomIndex=idx and (chain=gChain)}.atomno
+     var no = {atomIndex=BBidx}.atomno
-     no = getCpNo( no)
+    var i = 1
-     return ({(atomno=no) and (chain=gChain)}.atomIndex)
+    for (; i < 5; i++) {
+        if ({(atomno=@{no+i}) and (chain=gChain)
+            and thisModel}.atomName == "CB") {
+            break
+        }
+     }
+     return {(atomno=@{no+i}) and (chain=gChain) and thisModel}.atomIndex
 }
-function getCpNo (iNo) {
+function get_o_idx (BBidx) {
-     while ((iNo < gMaxNo) and ({(atomno=iNo) and (chain=gChain)}.atomName != "C")) {
+     var no = {atomIndex=BBidx}.atomno
-         iNo++
+    var i = 1
+    for (; i < 4; i++) {
+        if ({(atomno=@{no+i}) and (chain=gChain)
+            and thisModel}.atomName == "O") {
+            break
+         }
      }
-     return iNo
+     return {(atomno=@{no+i}) and (chain=gChain) and thisModel}.atomIndex
 }
-function getCApIdx (idx) {
+function get_nward_bb_idx (idx, iChain) {
-     var no = {atomIndex=idx and (chain=gChain)}.atomno
+     var no = {atomIndex=idx}.atomno - 1
-     no = getCApNo( no)
+     for (; no >= 0; no--) {
-    return ({(atomno=no) and (chain=gChain)}.atomIndex)
+        var atomName = {(atomno=no) and (chain=iChain)
-}
+            and thisModel}.atomName
+        if ((atomName = "N") or (atomName = "C") or (atomName = "CA")) {
-function getCmNo (iNo) {
+            break
-    while ((iNo > 0) and ({(atomno=iNo) and (chain=gChain)}.atomName != "C")) {
+         }
-         iNo--
      }
-     return iNo
+     return ((no >= 0) ? ({(atomno=no) and (chain=iChain)
+        and thisModel}.atomIndex) : -1)
 }
-function getCmIdx (idx) {
+function get_cward_bb_idx (idx, iChain) {
-     var no = {atomIndex=idx and (chain=gChain)}.atomno
+     var no = {atomIndex=idx}.atomno + 1
-     no = getCmNo( no)
+     for (; no < gMaxNo; no++) {
-    return ({(atomno=no) and (chain=gChain)}.atomIndex)
+        var atomName = {(atomno=no) and (chain=iChain)
-}
+            and thisModel}.atomName
+        if ((atomName = "N") or (atomName = "C") or (atomName = "CA")) {
-function getNmNo (iNo) {
+            break
-    while ((iNo > 0) and ({(atomno=iNo) and (chain=gChain)}.atomName != "N")) {
+         }
-         iNo--
      }
-     return iNo
+     return ((no >= 0) ? ({(atomno=no) and (chain=iChain)
+        and thisModel}.atomIndex) : -1)
 }
-function getNmIdx (idx) {
+function get_sc_set (scIdx, iChain) {
-     var no = {atomIndex=idx and (chain=gChain)}.atomno
+     var scSet = ({})
-     no = getNmNo( no)
+     var idx = get_sc_bb_idx(scIdx, iChain)
-     return ({(atomno=no) and (chain=gChain)}.atomIndex)
+     var iNo = {atomIndex=idx}.atomno + 3
-}
-function getNpNo (iNo) {
+    for (var i = 1; i < 20; i++) {
-    while ((iNo < gMaxNo) and ({(atomno=iNo) and (chain=gChain)}.atomName != "N")) {
+        idx = {(atomno=@{iNo+i}) and (chain=iChain)
-         iNo++
+            and thisModel}.atomIndex
+        if (is_bb_idx(idx)) {
+            break
+        }
+         scSet = scSet or {atomIndex=idx}
      }
-     return iNo
+     return scSet
 }
-function getNpIdx (idx) {
+function get_sc_bb_idx (idx, iChain) {
      var no = {atomIndex=idx}.atomno
-     no = getNpNo( no)
+     for (; no > 0; no--) {
-    return ({(atomno=no) and (chain=gChain)}.atomIndex)
+        if ({(atomno=no) and (chain=iChain)
-}
+            and thisModel}.atomName == "CA") {
+            break
-function getCBidx (BBidx) {
+        }
-    var no = {atomIndex=BBidx}.atomno
+        else if ({(atomno=no) and (chain=iChain)
-    var i = 1
+            and thisModel}.atomName == "C") {
-    for (; i < 5; i++) {
+            break
-         if ({(atomno=@{no+i}) and (chain=gChain)}.atomName == "CB") {
+         }
+        else if ({(atomno=no) and (chain=iChain)
+            and thisModel}.atomName == "N") {
              break
          }
-    }
+         else if ({(atomno=no) and (chain=iChain)
-    return {(atomno=@{no+i}) and (chain=gChain)}.atomIndex
+            and thisModel}.atomName == "CB") {
-}
+            no -= 3
-function getOidx (BBidx) {
-    var no = {atomIndex=BBidx}.atomno
-    var i = 1
-    for (; i < 4; i++) {
-         if ({(atomno=@{no+i}) and (chain=gChain)}.atomName == "O") {
              break
          }
      }
-     return {(atomno=@{no+i}) and (chain=gChain)}.atomIndex
+     return {(atomno=no) and (chain=iChain) and thisModel}.atomIndex
 }
-function getNwardBBno (iNo, iChain) {
+function is_bb_idx(aIdx) {
-     while ((iNo >= 0) and (
+     var ret = false
-        ({(atomno=iNo) and (chain=iChain)}.atomName != "N")
+    switch({atomIndex=aIdx}.atomName) {
-        and ({(atomno=iNo) and (chain=iChain)}.atomName != "C")
+    case "N":
-         and ({(atomno=iNo) and (chain=iChain)}.atomName != "CA"))) {
+    case "CA":
-         iNo--
+    case "C":
+         ret = true
+         break
      }
-     return iNo
+     return ret
 }
-function getNwardBBidx (idx, iChain) {
+function is_sc_idx(aIdx) {
-    var no = {atomIndex=idx}.atomno - 1
-    no = getNwardBBno( no, iChain)
-    return ((no >= 0) ? ({(atomno=no) and (chain=iChain)}.atomIndex) : -1)
-}
-function getCwardBBno (iNo, iChain) {
+     var ret = false
-     while ((iNo < gMaxNo) and (
+    if (not is_bb_idx(aIDx)) {
-        ({(atomno=iNo) and (chain=iChain)}.atomName != "N")
-        and ({(atomno=iNo) and (chain=iChain)}.atomName != "C")
-        and ({(atomno=iNo) and (chain=iChain)}.atomName != "CA"))) {
-        iNo++
-    }
-    return iNo
-}
-function getCwardBBidx (idx, iChain) {
+        ret = true
-    var no = {atomIndex=idx}.atomno + 1
+        switch({atomIndex=aIdx}.atomName) {
-     no = getCwardBBno( no, iChain)
+        case "O":
-     return ((no >= 0) ? ({(atomno=no) and (chain=iChain)}.atomIndex) : -1)
+        case "CB":
+            ret = false
+            break
+        }
+     }
+     return ret
 }
-function getScSet (scIdx, iChain) {
+function select_add_sc(fromIdx) {
-     var scSet = ({})
+     var iNo = {atomIndex=fromIdx}.atomno
-     var idx = getScBBidx(scIdx, iChain)
+     var iChain = {atomIndex=fromIdx}.chain
-    var iNo = {atomIndex=idx}.atomno + 3
+     select none
+     while ({(atomno=iNo) and (chain=iChain)
-     for (var i = 1; i < 20; i++) {
+        and thisModel and sidechain}) {
-         idx = {(atomno=@{iNo+i}) and (chain=iChain)}.atomIndex
+         var a = {(atomno=iNo) and (chain=iChain)and thisModel}
-         if (isBBidx(idx)) {
+         a.selected = true
-            break
+         iNo++
-         }
-        scSet = scSet or {atomIndex=idx}
      }
-    return scSet
 }
-function getScBBidx (idx, iChain) {
+# Resolve collisions on selection
-    var no = {atomIndex=idx}.atomno
+function handle_collisions( targetIdx) {
-    for (; no > 0; no--) {
-        if ({(atomno=no) and (chain=iChain)}.atomName == "CA") {
-            break
-        }
-        else if ({(atomno=no) and (chain=iChain)}.atomName == "C") {
-            break
-        }
-        else if ({(atomno=no) and (chain=iChain)}.atomName == "N") {
-            break
-        }
-        else if ({(atomno=no) and (chain=iChain)}.atomName == "CB") {
-            no -= 3
-            break
-        }
-    }
-    return {(atomno=no) and (chain=iChain)}.atomIndex
-}
-function isBBidx(aIdx) {
+    # For all selected atoms
-     var ret = FALSE
+     for (var iNo = {selected}.min.atomno; iNo <= {selected}.max.atomno; iNo++) {
-    switch({atomIndex=aIdx}.atomName) {
+         var idx = {(atomno=iNo) and (chain=gchain)
-    case "N":
+            and thisModel}.atomIndex
-    case "CA":
+        if ({atomindex=idx}.selected) {
-    case "C":
-         ret = TRUE
-        break
-    }
-    return ret
-}
-function isSCidx(aIdx) {
+            # Collect local colliders
+            var lcAtoms = (within(kCtolerance, false, {atomIndex=idx})
-    var ret = FALSE
+                and not {atomIndex=idx}
-    if (not isBBidx(aIDx)) {
+                and not {gOkCollide}
+                and not connected({atomIndex=idx}))
-        ret = TRUE
+            if (lcAtoms) {
-        switch({atomIndex=aIdx}.atomName) {
+                # Ignore kinked BB
-        case "O":
+                try {
-        case "CB":
+                    if (is_bb_idx(idx) and (angle(
-            ret = FALSE
+                        {atomIndex=@{get_cward_bb_idx(idx, gChain)}}, {atomIndex=idx},
-            break
+                        {atomIndex=@{get_nward_bb_idx(idx, gChain)}}) < 100.0)) {
-        }
+                        continue
-    }
+                    }
-    return ret
+                }
-}
+                catch {
+                }
-function addSideChainToSelection(CAno, isAdd, addOXT) {
+                # For all local colliders
-    var iNo = CAno+3
+                for (var c = 1; c <= lcAtoms.size; c++ ) {
-    while ({(atomno=iNo) and (chain=gChain)}.resno == {(atomno=CAno) and (chain=gChain)}.resno) {
+                    var cidx = lcAtoms[c].atomIndex
-        {(atomno=iNo) and (chain=gChain)}.selected = isAdd
-        if ({(atomno=iNo) and (chain=gChain)}.atomName == "OXT") {
-            {(atomno=iNo) and (chain=gChain)}.selected = addOXT
-        }
-        iNo++
-    }
-}
-function selectAddSideChain(fromIdx) {
+                    # If it is with water, delete it
-    var iNo = {atomIndex=fromIdx}.atomno
+                    if (lcAtoms[c].group = "HOH") {
-    var iChain = {atomIndex=fromIdx}.chain
+                        delete {atomIndex=cidx}
-    select none
+                    }
-    while ({(atomno=iNo) and (chain=iChain)}.atomName != "N") {
-        {(atomno=iNo) and (chain=iChain)}.selected = TRUE
-        iNo++
-        if (iNo > {chain=iChain}.atomno.max) {
-            break
-        }
-    }
-}
-# First and last are BB atoms
+                    # else if it is with side chain not proline, fix it
-# Any side atoms in the range are also selected
+                    else if (is_sc_idx(cidx) and ({atomIndex=cidx}.group != "PRO")) {
-function selectNwardIdx (firstIdx, lastIdx) {
+                        fix_sc_collision_2(cidx)
-    var firstno = ((firstIdx < 0) ? {atomIndex=lastIdx}.atomno : {atomIndex=firstIdx}.atomno)
-    var lastno = ((lastIdx < 0) ? firstno : {atomIndex=lastIdx}.atomno)
+                        # If not fixed, exit fail
-    var iChain = ((firstIdx < 0)
+                        if (not gOk2) {
-        ? {atomIndex=lastIdx}.chain : {atomIndex=firstIdx}.chain)
+                            return # early exit (break n jmol bug)
+                        }
+                    }
-    select (atomno <= firstno) and (atomno >= lastno) and (chain = iChain)
+                    # else if it is itself a side chain not proline, fix it
+                    else if (is_sc_idx(idx) and ({atomIndex=idx}.group != "PRO")) {
+                        fix_sc_collision_2(idx)
-    if ({(atomno=firstno) and (chain=gChain)}.atomName == "C") { # if psi
+                        # If not fixed, exit fail
-        addSideChainToSelection(firstno-1, TRUE, TRUE)
+                        if (not gOk2) {
-        {(atomno=@{firstno+1}) and (chain=iChain)}.selected = TRUE # add O
+                            return # early exit (break n jmol bug)
-    }
+                        }
-    if ({(atomno=firstno) and (chain=iChain)}.atomName == "CA") {
+                    }
-        addSideChainToSelection(firstno, TRUE, FALSE)
-    }
-    if ({(atomno=lastno) and (chain=iChain)}.atomName == "C") { # if psi
-        addSideChainToSelection(lastno-1, FALSE, FALSE)
-    }
-}
-# First and last are BB atoms
+                    # Else if it is with O, counter-rotate
-# Any side atoms in the range are also selected
+                    else if (lcAtoms[c].atomName = "O") {
-function selectCwardIdx (firstIdx, lastIdx) {
+                        counter_rotate_2(lcAtoms[c].atomIndex,
-    var firstno = ((firstIdx < 0) ? gMaxNo : {atomIndex=firstIdx}.atomno)
+                            {atomIndex=idx}.xyz, targetIdx, false)
-    var lastno = ((lastIdx < 0) ? 1 : {atomIndex=lastIdx}.atomno)
-    var iChain = ((firstIdx < 0)
-        ? {atomIndex=lastIdx}.chain : {atomIndex=firstIdx}.chain)
-    # If nWard anchor in range, begin selection with it
+                        # If not fixed, exit fail
-    if ((gNanchorIdx >= 0) and ({atomIndex=gNanchorIdx}.chain == iChain))  {
+                        if (not gOk2) {
-        var aNo = {atomIndex=gNanchorIdx}.atomno
+                            return # early exit (break n jmol bug)
-        if (aNo > firstNo) {
+                        }
-            firstno = aNo
+                    }
-        }
-    }
-    # If cWard anchor in range, end selection with it
+                    # Else if it is itself O, counter-rotate
-    if ((gCanchorIdx >= 0) and ({atomIndex=gCanchorIdx}.chain == iChain))  {
+                    else if ({atomIndex=idx}.atomName = "O") {
-        var aNo = {atomIndex=gCanchorIdx}.atomno
+                        counter_rotate_2(idx, lcAtoms[c].xyz, targetIdx, false)
-        if (aNo < lastNo) {
-            lastno = aNo
-        }
-    }
-    select (atomno >= firstno) and (atomno <= lastno) and (chain = iChain)
+                        # If not fixed, exit fail
+                        if (not gOk2) {
+                            return # early exit (break n jmol bug)
+                        }
+                    }
-    if ({(atomno=firstno) and (chain=iChain)}.atomName == "C") { # if psi
+                    else {    # Else not fixed, exit fail
-        addSideChainToSelection(firstno-1, FALSE, FALSE)
+                        gOk2 = false
-    }
+                        return # early exit (break n jmol bug)
-    if ({(atomno=lastno) and (chain=iChain)}.atomName == "CA") {
+                    }
-        addSideChainToSelection(lastno, TRUE, FALSE)
+                } # endfor
-    }
+            }
-    if ({(atomno=lastno) and (chain=iChain)}.atomName == "C") { # if psi
+         }
-        addSideChainToSelection(lastno-1, TRUE, TRUE)
+     } # endfor iNo
-         {(atomno=@{lastno+1}) and (chain=iChain)}.selected = TRUE # add O
-     }
 }
-# Selected must include second parameter but not the first
+# Rotate rotor set to move target atom to its proper place
-function setDistanceIdx (staticIdx, mobileIdx, desired) {
+function tug_track_idx(targetIdx, targetPt, nWard, cDetect) {
-     try {
+     gOK = false
-        var v = {atomIndex=mobileIdx}.xyz - {atomIndex=staticIdx}.xyz
+    var pt = targetPt
-        var dist = distance({atomIndex=staticIdx}, {atomIndex=mobileIdx})
+    var dist = distance(pt, {atomIndex=targetIdx}.xyz)
-        translateSelected @{((v * (desired/dist)) - v)}
-    }
-    catch {
-    }
-}
+    var rotors = (nWard ? gNrotors : gCrotors)
-# Selected must include third parameter but not the first
+    # For a number of passes
-function setAngleIdx (statorIdx, pivotIdx, rotorIdx, toangle) {
+    for (var pass1 = 0; pass1 < 20; pass1++) {
-    try {
+         var blocked = ({})
-        var v1={atomIndex=statorIdx}.xyz - {atomIndex=pivotIdx}.xyz
+         for (var pass2 = 0; pass2 < (rotors.size/4); pass2++) {
-         var v2={atomIndex=rotorIdx}.xyz - {atomIndex=pivotIdx}.xyz
-         var axis = cross(v1, v2) + {atomIndex=pivotIdx}.xyz
-        var curangle =  angle({atomIndex=statorIdx},
-            {atomIndex=pivotIdx}, {atomIndex=rotorIdx})
-        rotateselected @axis {atomIndex = pivotIdx} @{curangle-toangle}
-    }
-    catch {
-    }
-}
-# Selected must include fourth parameter but not the first
+            var v1 = {atomIndex=targetIdx}.xyz - pt
-function setDihedralIdx (stator1idx, stator2idx, rotor1idx, rotor2idx, toangle) {
-    try {
-        var a1={atomIndex = stator1idx}.xyz
-        var a2={atomIndex = stator2idx}.xyz
-        var a3={atomIndex = rotor1idx}.xyz
-        var a4={atomIndex = rotor2idx}.xyz
-        var curangle =  angle(a1, a2, a3, a4)
-        rotateselected {a3} {a2} @{curangle-toangle}
-    }
-    catch {
-    }
-}
-function countCollisions(rc) {
+            # Find the most orthgonal unused rotor
-    var cAtoms = ({})
+            var imax = 0
-    for (var idx = {*}.min.atomIndex; idx <= {*}.max.atomIndex; idx++) {
+            var smax = 0.5
-        if ({atomIndex=idx}.size > 0) {
+            for (var i = 1; i < rotors.size; i += 4) {
-            var lcAtoms = (within(kCtolerance, FALSE, {atomIndex=idx})
+                var i2 = rotors[i+1]
-                and {atomIndex > idx}
+                var i3 = rotors[i+2]
-                and not {rc}
+                var i4 = rotors[i+3]
-                and not connected({atomIndex=idx}))
+                if ((i2 != targetIdx) and (i3 != targetIdx) and (i4 != targetIdx)) {
-            if (lcAtoms.size > 0) {
+                    if ({blocked and {atomIndex=i2}}.count == 0) {
-                cAtoms = cAtoms or lcAtoms
+                        var v2 = {atomIndex=i3}.xyz - {atomIndex=i2}.xyz
-            }
-        }
-    }
-    return cAtoms.size
-}
-# Resolve collisions
-function handleCollisions2( targetIdx) {
-    # For all selected atoms
+                        var s = sin(abs(angle(v1, {0 0 0}, v2)))
-    for (var iNo = {selected}.min.atomno; iNo <= {selected}.max.atomno; iNo++) {
+                        if (s > smax) {
-        var idx = {(atomno=iNo) and (chain=gchain)}.atomIndex
+                            smax = s
-        if ({atomindex=idx}.selected) {
+                            imax = i
+                        }
-            # Collect local colliders
+                     }
-            var lcAtoms = (within(kCtolerance, FALSE, {atomIndex=idx})
-                and not {atomIndex=idx}
-                and not {gOkCollide}
-                and not connected({atomIndex=idx}))
-            if (lcAtoms.size > 0) {
-                # Ignore kinked BB
-                if (isBBidx(idx) and angle({atomIndex=@{getCwardBBidx(idx, gChain)}},
-                     {atomIndex=idx} , {atomIndex=@{getNwardBBidx(idx, gChain)}}) < 100) {
-                    continue
                  }
+            }
-                # For all local colliders
+            # If no more rotors, break to next full try
-                for (var c = 1; c <= lcAtoms.size; c++ ) {
+            if (imax == 0) {
-                    var cidx = lcAtoms[c].atomIndex
+               break
+            }
+            var i1 = rotors[imax+0]
+            var i2 = rotors[imax+1]
+            var i3 = rotors[imax+2]
+            var i4 = rotors[imax+3]
-                    # If it is with water, delete it
+            # Get dihedral of rotor with target point
-                    if (lcAtoms[c].group = "HOH") {
+            var dt = angle({atomIndex=targetIdx}, {atomIndex=i2}, {atomIndex=i3}, pt)
-                        delete {atomIndex=cidx}
+            var dh = angle({atomIndex=i1}, {atomIndex=i2}, {atomIndex=i3}, {atomIndex=i4})
-                    }
+            if (abs(dh).type == "string") {
+                dh = -50
+            }
+            var psi = dh + dt
+            var phi = dh + dt
-                    # else if it is with side chain not proline, fix it
+            # Compute resultant psi and phi
-                    else if (isSCidx(cidx) and ({atomIndex=cidx}.group != "PRO")) {
+            #  and select from target atom to first half of rotor
-                        fixSCcollision2(cidx)
+            var movePt = false
-                         recollect = TRUE
+            if (nWard) {
+                if ({atomIndex=i2}.atomName="CA") {
-                        # If not fixed, exit fail
+                    psi = angle({atomIndex=@{get_cward_bb_idx(i1, gChain)}}, {atomIndex=i1},
-                         if (not gOk2) {
+                         {atomIndex=i2}, {atomIndex=i3}) + dt
-                            return # early exit (break n jmol bug)
+                }
-                        }
+                else {
-                    }
+                    phi = angle({atomIndex=i1}, {atomIndex=i2},
+                         {atomIndex=i3}, {atomIndex=@{get_nward_bb_idx(i3, gChain)}}) + dt
+                }
-                     # else if it is itself a side chain not proline, fix it
+                if ({atomIndex=i2}.atomno > {atomIndex=targetIdx}.atomno) {
-                    else if (isSCidx(idx) and ({atomIndex=idx}.group != "PRO")) {
+                     movePt = true
-                         fixSCcollision2(idx)
+                    select_nward_idx(i3, get_cward_bb_idx(targetIdx, gChain))
-                         recollect = TRUE
+                    {atomIndex=targetIdx}.selected = true
+                }
+                else {
+                    select_cward_idx(i2, targetIdx)
+                }
+            }
+            else {
+                if (({atomIndex=i2}.atomName="CA")) {
+                    phi = angle({atomIndex=@{get_nward_bb_idx(i1, gChain)}}, {atomIndex=i1},
+                         {atomIndex=i2}, {atomIndex=i3}) + dt
+                }
+                else {
+                    psi = angle({atomIndex=i2}, {atomIndex=i3},
+                         {atomIndex=i4}, {atomIndex=@{get_cward_bb_idx(i4, gChain)}}) + dt
+                }
-                        # If not fixed, exit fail
+                if ({atomIndex=i2}.atomno < {atomIndex=targetIdx}.atomno) {
-                        if (not gOk2) {
+                    movePt = true
-                            return # early exit (break n jmol bug)
+                    select_cward_idx(i3, get_nward_bb_idx(targetIdx, gChain))
-                        }
+                    {atomIndex=targetIdx}.selected = true
-                     }
+                }
+                else {
+                     select_nward_idx(i2, targetIdx)
+                }
+            }
-                    # Else if it is with O, counter-rotate
+            # Relax rules if desperate
-                    else if (lcAtoms[c].atomName = "O") {
+            if (pass1 > 10) {
-                        counterRotate2(lcAtoms[c].atomIndex,
+                phi = -50
-                            {atomIndex=idx}.xyz, targetIdx, FALSE)
+            }
-                        # If not fixed, exit fail
+            # If rotation within ramachandran limits
-                        if (not gOk2) {
+            if ((abs(dt) >= 0.1) and
-                            return # early exit (break n jmol bug)
+                (({atomIndex=i2}.group=="GLY") or (phi < 0))) {
-                        }
-                    }
-                    # Else if it is itself O, counter-rotate
+                # If moving target point, put the target atom there
-                    else if ({atomIndex=idx}.atomName = "O") {
+                var cp = {atomIndex=targetIdx}.xyz
-                        counterRotate2(idx, lcAtoms[c].xyz, targetIdx, FALSE)
+                if (movePt) {
+                    dt = -dt
+                    {atomIndex=targetIdx}.xyz = pt
+                }
-                        # If not fixed, exit fail
+                # Rotate to minimize vector ====================
+                rotateSelected {atomIndex=i2} {atomIndex=i3} @dt
+                # If collision checking
+                if (cDetect) {
+                    # If collision, back off by eighths
+                    var wasCollision = false
+                    for (var ci = 0; ci < 4; ci++) {
+                        if (ci < 3) {
+                            dt /= 2
+                        }
+                        handle_collisions( targetIdx)
                          if (not gOk2) {
-                             return # early exit (break n jmol bug)
+                             wasCollision = true
+                            rotateSelected {atomIndex=i2} {atomIndex=i3} @{-dt}
+                        }
+                        else if (wasCollision) {
+                            if (ci <3) {
+                                rotateSelected {atomIndex=i2} {atomIndex=i3} @{dt}
+                            }
+                        }
+                        else {
+                            break
                          }
-                    }
-                    else {    # Else not fixed, exit fail
+                         if (dt < 0.01) {
-                         gOk2 = FALSE
+                            break
-                        return # early exit (break n jmol bug)
+                        }
-                    }
+                    } # endfor
-                } # endfor
+                }
-            }
-        }
-    } # endfor iNo
-}
-# Rotate rotor set to move target atom to its proper place
+                # If moving target point, put the target atom back
-function tugTrackIdx(targetIdx, targetPt, nWard, cDetect) {
+                if (movePt) {
-    gOK = FALSE
+                    pt = {atomIndex=targetIdx}.xyz
-    var pt = targetPt
+                    {atomIndex=targetIdx}.xyz = cp
-    var dist = distance(pt, {atomIndex=targetIdx}.xyz)
+                }
-    var rotors = (nWard ? gNrotors : gCrotors)
+            }
-    # For a number of passes
+            # If close enough, stop
-    for (var pass1 = 0; pass1 < 20; pass1++) {
+            if (distance(pt, {atomIndex=targetIdx}) < kDtolerance) {
-        var blocked = ({})
+                gOK = true
-        for (var pass2 = 0; pass2 < (rotors.size/4); pass2++) {
+                gTargetPt = pt
+                break
+            }
+            # Block rotor
+            blocked |= {atomIndex=i2}
-            var v1 = {atomIndex=targetIdx}.xyz - pt
+        }   # endfor num rotors passes
-            # Find the most orthgonal unused rotor
+        if (gOK) {
-            var imax = 0
+            break
-            var smax = 0.5
+        }
-            for (var i = 1; i < rotors.size; i += 4) {
+    }   # endfor 20 passes
-                var i2 = rotors[i+1]
+}
-                var i3 = rotors[i+2]
-                var i4 = rotors[i+3]
-                if ((i2 != targetIdx) and (i3 != targetIdx) and (i4 != targetIdx)) {
-                    if ({blocked and {atomIndex=i2}}.count == 0) {
-                        var v2 = {atomIndex=i3}.xyz - {atomIndex=i2}.xyz
-                        var s = sin(abs(angle(v1, {0 0 0}, v2)))
+# Counter rotate bonds on either side of a BB O
-                        if (s > smax) {
+function do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nWard) {
-                            smax = s
-                            imax = i
-                        }
-                    }
-                }
-            }
-            # If no more rotors, break to next full try
+    # Rotate psi
-            if (imax == 0) {
+    {atomIndex=nIdx}.selected = nWard
-               break
+    {atomIndex=cIdx}.selected = nWard
-            }
+    {atomIndex=oIdx}.selected = nward
-            var i1 = rotors[imax+0]
+    rotateSelected {atomIndex=caPsiIdx} {atomIndex=cIdx} @{dir}
-            var i2 = rotors[imax+1]
-            var i3 = rotors[imax+2]
-            var i4 = rotors[imax+3]
-            # Get dihedral of rotor with target point
+    # Counter-rotate phi
-            var dt = angle({atomIndex=targetIdx}, {atomIndex=i2}, {atomIndex=i3}, pt)
+    {atomIndex=nIdx}.selected = not nWard
-            var dh = angle({atomIndex=i1}, {atomIndex=i2}, {atomIndex=i3}, {atomIndex=i4})
+    {atomIndex=cIdx}.selected = not nWard
-            if (dh == "NaN") {
+    {atomIndex=oIdx}.selected = not nward
-                dh = -50
+    rotateSelected {atomIndex=nIdx} {atomIndex=caPhiIdx} @{-dir}
-            }
+}
-            var psi = dh + dt
-            var phi = dh + dt
+function counter_rotate(oIdx, dir, nWard) {
-            # Compute resultant psi and phi
+    var iChain = {atomIndex=oIdx}.chain
-            #  and select from target atom to first half of rotor
+    var selsave = {selected}
-            var movePt = FALSE
+    var cIdx = get_sc_bb_idx(oIdx, iChain)
-            if (nWard) {
+    var nIdx = get_cward_bb_idx(cIdx, iChain)
-                if ({atomIndex=i2}.atomName="CA") {
+    var caPhiIdx = get_cward_bb_idx(nIdx, iChain)
-                    psi = angle({atomIndex=@{getCwardBBidx(i1, gChain)}}, {atomIndex=i1},
+    var caPsiIdx = get_nward_bb_idx(cIdx, iChain)
-                        {atomIndex=i2}, {atomIndex=i3}) + dt
-                }
-                else {
-                    phi = angle({atomIndex=i1}, {atomIndex=i2},
-                        {atomIndex=i3}, {atomIndex=@{getNwardBBidx(i3, gChain)}}) + dt
-                }
-                if ({atomIndex=i2}.atomno > {atomIndex=targetIdx}.atomno) {
+    if (nWard) {
-                    movePt = TRUE
+        var nNo = {(chain=iChain) and thisModel}.atomno.min
-                    selectNwardIdx(i3, getCwardBBidx(targetIdx, gChain))
+        select_nward_idx(caPsiIdx, {(atomno=nNo) and (chain=iChain)
-                    {atomIndex=targetIdx}.selected = TRUE
+            and thisModel}.atomIndex)
-                }
+    }
-                else {
+    else {
-                    selectCwardIdx(i2, targetIdx)
+        var cNo = {(chain=iChain) and thisModel}.atomno.max
-                }
+        select_cward_idx(caPhiIdx, {(atomno=cNo) and (chain=iChain)
-            }
+            and thisModel}.atomIndex)
-            else {
+    }
-                if (({atomIndex=i2}.atomName="CA")) {
-                    phi = angle({atomIndex=@{getNwardBBidx(i1, gChain)}}, {atomIndex=i1},
-                        {atomIndex=i2}, {atomIndex=i3}) + dt
-                }
-                else {
-                    psi = angle({atomIndex=i2}, {atomIndex=i3},
-                        {atomIndex=i4}, {atomIndex=@{getCwardBBidx(i4, gChain)}}) + dt
-                }
-                if ({atomIndex=i2}.atomno < {atomIndex=targetIdx}.atomno) {
+    # Counter-rotate
-                    movePt = TRUE
+    do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, not nWard)
-                    selectCwardIdx(i3, getNwardBBidx(targetIdx, gChain))
+    select selsave
-                    {atomIndex=targetIdx}.selected = TRUE
+}
-                }
-                else {
-                    selectNwardIdx(i2, targetIdx)
-                }
-            }
-            # Relax rules if desperate
+function counter_rotate_2(oIdx, toPt, terminalIdx, oDrag) {
-            if (pass1 > 10) {
-                phi = -50
-            }
-            # If rotation within ramachandran limits
+    var iChain = {atomIndex=oIdx}.chain
-            if ((abs(dt) >= 0.1) and
+    var selsave = {selected}
-                (({atomIndex=i2}.group=="GLY") or (phi < 0))) {
+    var gOk2 = true
+    var cIdx = get_sc_bb_idx(oIdx, iChain)
+    var nIdx = get_cward_bb_idx(cIdx, iChain)
+    var caPhiIdx = get_cward_bb_idx(nIdx, iChain)
+    var caPsiIdx = get_nward_bb_idx(cIdx, iChain)
-                # If moving target point, put the target atom there
+    var nTward = ({atomIndex=oIdx}.atomno < {atomIndex=terminalIdx}.atomno)
-                var cp = {atomIndex=targetIdx}.xyz
+    if (nTward) {
-                if (movePt) {
+        select_cward_idx(cIdx, terminalIdx)
-                    dt = -dt
+    }
-                    {atomIndex=targetIdx}.xyz = pt
+    else {
-                }
+        select_nward_idx(nIdx, terminalIdx)
+    }
+    # Until all collisions cancelled
+    var dir = 5
+    var ang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})
+    var tcount = 0
+    while (oDrag or (within(kCtolerance, false, {atomIndex=oIdx})
+            and not {atomIndex=oIdx} and not connected({atomIndex=oIdx})
+            and not {gOkCollide} > 0)) {
-                # Rotate to minimize vector ====================
+        # Counter-rotate
-                rotateSelected {atomIndex=i2} {atomIndex=i3} @dt
+        do_counter_rotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nTward)
+        var newang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})
-                # If collision checking
+        # If wrong direction once, undo and reverse
-                if (cDetect) {
+        if (newang > ang) {
+            do_counter_rotate(caPhiIDx, nIdx, cIdx, oIdx, caPsiIdx, -dir, nTward)
-                    # If collision, back off by eighths
+            # If first time, continue in opposite direction
-                    var wasCollision = FALSE
+            dir *= -1
-                    for (var ci = 0; ci < 4; ci++) {
+            if (dir < 0) {
-                        if (ci < 3) {
+                continue
-                            dt /= 2
+            }
-                        }
+        }
-                        handleCollisions2( targetIdx)
-                        if (not gOk2) {
-                            wasCollision = TRUE
-                            rotateSelected {atomIndex=i2} {atomIndex=i3} @{-dt}
-                        }
-                        else if (wasCollision) {
-                            if (ci <3) {
-                                rotateSelected {atomIndex=i2} {atomIndex=i3} @{dt}
-                            }
-                        }
-                        else {
-                            break
-                        }
-                        if (dt < 0.01) {
+        if (oDrag) {
-                            break
+            break
-                        }
+        }
-                    } # endfor
-                }
-                # If moving target point, put the target atom back
+        # If no go, undo and exit
-                if (movePt) {
+        tcount++
-                    pt = {atomIndex=targetIdx}.xyz
+        if (tcount > (360/abs(dir))) {
-                    {atomIndex=targetIdx}.xyz = cp
+            gOk2 = false
-                }
+            break
+        }
-            }
+    } # endwhile
+    select selsave
+}
-            # If close enough, stop
+# Repair proline
-            if (distance(pt, {atomIndex=targetIdx}) < kDtolerance) {
+function repair_proline(BBidx) {
-                gOK = TRUE
+    var cbidx = get_cb_idx(BBidx)
-                gTargetPt = pt
+    var cbno = {atomIndex=cbidx}.atomno
-                break
+    var cgidx = {(atomno=@{cbno+1}) and (chain=gChain)
-            }
+        and thisModel}.atomIndex
+    var cdidx = {(atomno=@{cbno+2}) and (chain=gChain)
+        and thisModel}.atomIndex
+    var caidx = {(atomno=@{cbno-3}) and (chain=gChain)
+        and thisModel}.atomIndex
+    var nidx = {(atomno=@{cbno-4}) and (chain=gChain)
+        and thisModel}.atomIndex
-            # Block rotor
+    select {atomIndex=cbidx}
-            blocked |= {atomIndex=i2}
+    set_angle_idx(nidx, caidx, cbidx, 109.5)
-        }   # endfor num rotors passes
+    select {atomIndex=cdidx}
+    set_distance_idx(nidx, cdidx, 1.47)
+    set_angle_idx(caidx, nidx, cdidx, 102.7)
+    set_dihedral_idx(cbidx, caidx, nidx, cdidx, 16.2)
-        if (gOK) {
+    select {atomIndex=cgidx}
-            break
+    set_distance_idx(cdidx, cgidx, 1.51)
-        }
+    set_angle_idx(nidx, cdidx, cgidx, 106.4)
-     }   # endfor 10 passes
+     set_dihedral_idx(caidx, nidx, cdidx, cgidx, 16.2)
 }
-# Counter rotate bonds on either side of a BB O
+# Repair side chain
-function docounterRotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nWard) {
+function repair_sc(targetIdx, nWard) {
-     # Rotate psi
+     var idx = (nWard ? get_cward_bb_idx(targetIdx, gChain) : get_nward_bb_idx(targetIdx, gChain))
-    {atomIndex=nIdx}.selected = nWard
-    {atomIndex=cIdx}.selected = nWard
-    {atomIndex=oIdx}.selected = nward
-    rotateSelected {atomIndex=caPsiIdx} {atomIndex=cIdx} @{dir}
-     # Counter-rotate phi
+     if (({atomIndex=targetIdx}.atomName == "CA")
-    {atomIndex=nIdx}.selected = not nWard
+        and ({atomIndex=targetIdx}.group != "GLY")) {
-    {atomIndex=cIdx}.selected = not nWard
+        var cbidx = get_cb_idx(targetIdx)
-    {atomIndex=oIdx}.selected = not nward
+        select none
-    rotateSelected {atomIndex=nIdx} {atomIndex=caPhiIdx} @{-dir}
+        select_add_sc(cbidx)
-}
+        set_angle_idx(idx, targetIdx, cbidx, 110.0)
+        set_distance_idx(targetIdx, cbidx, 1.5)
-function counterRotate(oIdx, dir, nWard) {
+        if ({atomIndex=targetIdx}.group != "PRO") {
+            var colliders = (within(kCtolerance, false, {selected})
-    var iChain = {atomIndex=oIdx}.chain
+                and not {atomIndex=targetIdx} and not {selected})
-    var selsave = {selected}
+            if (colliders) {
-    var cIdx = getScBBidx(oIdx, iChain)
+                if ({atomIndex=targetIdx}.group != "ALA") {
-    var nIdx = getCwardBBidx(cIdx, iChain)
+                    fix_sc_collision_2(cbidx)
-    var caPhiIdx = getCwardBBidx(nIdx, iChain)
+                }
-    var caPsiIdx = getNwardBBidx(cIdx, iChain)
+            }
+        }
-    if (nWard) {
+        else {
-        nNo = {chain=iChain}.atomno.min
+            if (nWard) {
-        selectNwardIdx(caPsiIdx, {(atomno=nNo) and (chain=iChain)}.atomIndex)
+            }
-    }
+            else {
-    else {
+                set_dihedral_idx(get_nward_bb_idx(idx, gChain), idx, targetIdx, cbidx, 174.2)
-        cNo = {chain=iChain}.atomno.max
+            }
-        selectCwardIdx(caPhiIdx, {(atomno=cNo) and (chain=iChain)}.atomIndex)
+        }
      }
-     # Counter-rotate
+     else if ({atomIndex=targetIdx}.atomName == "C") {
-    docounterRotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, not nWard)
+        var oidx = get_o_idx(targetIdx)
-     select selsave
+        select {atomIndex=oidx}
-}
+        set_angle_idx(idx, targetIdx, oidx, 120.0)
+        set_distance_idx(targetIdx, oidx, 1.21)
+        if (nWard) {
+            set_dihedral_idx(get_cward_bb_idx(idx, gChain), idx, targetIdx, oidx, 0.0)
+        }
+        if ({atomIndex=idx}.group == "PRO") {
+            repair_proline(idx)
+            var dNo = {atomIndex=targetIdx}.atomno + 4
+            var dIdx = {(atomno=dNO) and (chain=gChain)
+                and thisModel}.atomIndex
+            var colliders = (within(kCtolerance, false, {atomIndex=dIdx})
+                and not connected({atomIndex=dIdx})
+                and not {atomIndex=dIdx})
+            for (var i = 1; i <= colliders.size; i++) {
+                if (colliders[i].atomName == "O") {
+                    counter_rotate_2(colliders[i].atomIndex,
+                        {atomIndex=dIdx}.xyz, targetIdx, false)
+                }
+            }
+        }
+     }
+}
-function counterRotate2(oIdx, toPt, terminalIdx, oDrag) {
+# Rebuild Cward rotors set
+function tug_track_c() {
-     var iChain = {atomIndex=oIdx}.chain
+     # For all bb atoms cWard of cargo
-    var selsave = {selected}
+     var targetIdx = gCcargoIdx
-    var gOk2 = TRUE
+     var okCount = 0
-    var cIdx = getScBBidx(oIdx, iChain)
-    var nIdx = getCwardBBidx(cIdx, iChain)
-     var caPhiIdx = getCwardBBidx(nIdx, iChain)
-     var caPsiIdx = getNwardBBidx(cIdx, iChain)
-     var nTward = ({atomIndex=oIdx}.atomno < {atomIndex=terminalIdx}.atomno)
+     # Allow collisions with cargo
-     if (nTward) {
+     gOkCollide = gCargoSet
-        selectCwardIdx(cIdx, terminalIdx)
+     var tcount = 0
-     }
+     while (targetIdx != gNanchorIdx) {
-     else {
-        selectNwardIdx(nIdx, terminalIdx)
-    }
-    # Until all collisions cancelled
+         # Step to next atom
-    var dir = 5
+         targetIdx = get_cward_bb_idx(targetIdx, gChain)
-    var ang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})
+         if (targetIdx < 0) {
-    var tcount = 0
+             break
-    while (oDrag or (within(kCtolerance, FALSE, {atomIndex=oIdx})
-            and not {atomIndex=oIdx} and not connected({atomIndex=oIdx})
-            and not {gOkCollide} > 0)) {
-         # Counter-rotate
-         docounterRotate(caPhiIdx, nIdx, cIdx, oIdx, caPsiIdx, dir, nTward)
-        var newang = angle(toPt, {atomIndex=oIdx}, {atomIndex=cIdx})
-        # If wrong direction once, undo and reverse
-         if (newang > ang) {
-            docounterRotate(caPhiIDx, nIdx, cIdx, oIdx, caPsiIdx, -dir, nTward)
-            # If first time, continue in opposite direction
-            dir *= -1
-            if (dir < 0) {
-                continue
-             }
          }
-         if (oDrag) {
+        # No collision with cargo allowed after two atoms placed
-            break
+         if (tcount == 2) {
+           gOkCollide = ({})
          }
+        tcount++
-         # If no go, undo and exit
+         # Compute targets desired coords
-        tcount++
+        try {
-        if (tcount > (360/abs(dir))) {
+            var c1idx = get_cward_bb_idx(targetIdx, gChain)
-             gOk2 = FALSE
+            var n1idx = get_nward_bb_idx(targetIdx, gChain )
-             break
+            var n2idx = get_nward_bb_idx(n1Idx, gChain)
+            var n3idx = get_nward_bb_idx(n2Idx, gChain)
+            var pt = {0 0 0}
+            if ({atomIndex=targetIdx}.atomName == "N") {
+                var oidx = get_o_idx(n1idx)
+                select {atomIndex=oidx}
+                # Desired target location is trigonal O
+                set_distance_idx(n1idx, oidx, 1.5)
+                pt = get_trigonal_idx(n2idx, n1idx, oidx, 1.37)
+                set_distance_idx(n1idx, oidx, 1.21)
+            }
+            else if (({atomIndex=targetIdx}.atomName == "C")
+                and ({atomIndex=targetIdx}.group != "GLY")) {
+                # Desired target location is tetragonal CB
+                var cbidx = get_cb_idx(n1idx)
+                pt = get_tet_idx(n2idx, n1idx, cbidx, 1.5)
+            }
+            else { # CA (or GLY C)
+                # Save current target coords
+                var cp = {atomIndex=targetIdx}.xyz
+                # Set target atom at desired distance and angle
+                select {atomIndex=targetIdx}
+                set_distance_idx(n1idx, targetIdx, 1.5)
+                set_angle_idx(n2idx, n1idx, targetIdx, 120.0)
+                if ({atomIndex=targetIdx}.atomName == "CA") {
+                    set_dihedral_idx(n3idx, n2idx, n1idx, targetIdx, 180)
+                }
+                # Record and restore target
+                pt = {atomIndex=targetIdx}.xyz
+                {atomIndex=targetIdx}.xyz = cp
+            }
+            # If target not at desired location
+            if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
+                okCount = 0
+                gTargetPt = pt
+                var xcount = 0
+                gOK = false
+                while ((xcount < 20) and (not gOK)) {
+                    # Rotate on cWard rotor set to move it there
+                    tug_track_idx(targetIdx, pt, false, false)
+                    xcount++
+                }
+            }
+             else {
+                gOK = true
+                okCount++
+             }
+        }
+        catch {
          }
-    } # endwhile
+        # If successful
-    select selsave
+        if (gOK == true) {
-}
-# Repair proline
+            # Adust any side atoms
-function repairProline(BBidx) {
+            repair_sc(targetIdx, false)
-    var cbidx = getCBidx(BBidx)
+        }
-    var cbno = {atomIndex=cbidx}.atomno
-    var cgidx = {(atomno=@{cbno+1}) and (chain=gChain)}.atomIndex
-    var cdidx = {(atomno=@{cbno+2}) and (chain=gChain)}.atomIndex
-    var caidx = {(atomno=@{cbno-3}) and (chain=gChain)}.atomIndex
-    var nidx = {(atomno=@{cbno-4}) and (chain=gChain)}.atomIndex
-    select {atomIndex=cbidx}
+        # Else fail
-    setAngleIdx(nidx, caidx, cbidx, 109.5)
+        else {
+            break
+        }
-    select {atomIndex=cdidx}
+        # If no movement in 4 tries, we are done
-    setDistanceIdx(nidx, cdidx, 1.47)
+        if (okCount > 3) {
-     setAngleIdx(caidx, nidx, cdidx, 102.7)
+            break
-    setDihedralIdx(cbidx, caidx, nidx, cdidx, 16.2)
+        }
+     } # endwhile (targetIdx != gCanchorIdx) {
+}
-    select {atomIndex=cgidx}
+# Rebuild Nward rotors set
-    setDistanceIdx(cdidx, cgidx, 1.51)
+function tug_track_n() {
-    setAngleIdx(nidx, cdidx, cgidx, 106.4)
-    setDihedralIdx(caidx, nidx, cdidx, cgidx, 16.2)
-}
-# Repair side chain
+    gOK = true
-function repairSideChain(targetIdx, nWard) {
-     var idx = (nWard ? getCwardBBidx(targetIdx, gChain) : getNwardBBidx(targetIdx, gChain))
+    # For all bb atoms nWard of cargo
+    var targetIdx = gNcargoIdx
+     var okCount = 0
-     if (({atomIndex=targetIdx}.atomName == "CA")
+     # Allow collisions with cargo
-        and ({atomIndex=targetIdx}.group != "GLY")) {
+    gOkCollide = gCargoSet
-        var cbidx = getCBidx(targetIdx)
+    var tcount = 0
-        select none
+    while (targetIdx != gNanchorIdx) {
-         selectAddSideChain(cbidx)
-         setAngleIdx(idx, targetIdx, cbidx, 110.0)
+         # Step to next atom
-        setDistanceIdx(targetIdx, cbidx, 1.5)
+         targetIdx = get_nward_bb_idx(targetIdx, gChain)
-         if ({atomIndex=targetIdx}.group != "PRO") {
+         if (targetIdx < 0) {
-            var colliders = (within(kCtolerance, FALSE, {selected})
+             break
-                and not {atomIndex=targetIdx} and not {selected})
-            if (colliders.size > 0) {
-                if ({atomIndex=targetIdx}.group != "ALA") {
-                    fixSCcollision2(cbidx)
-                }
-             }
          }
-         else {
-            if (nWard) {
+        # No collision with cargo allowed after two atoms placed
-            }
+        if (tcount == 2) {
-            else {
+           gOkCollide = ({})
-                setDihedralIdx(getNwardBBidx(idx, gChain), idx, targetIdx, cbidx, 174.2)
-            }
          }
-    }
+        tcount++
-    else if ({atomIndex=targetIdx}.atomName == "C") {
+        # Compute targets desired coords
-        var oidx = getOidx(targetIdx)
+        var n1idx = get_nward_bb_idx(targetIdx, gChain)
-        select {atomIndex=oidx}
+        var c1idx = get_cward_bb_idx(targetIdx, gChain)
-        setAngleIdx(idx, targetIdx, oidx, 120.0)
+        var c2idx = get_cward_bb_idx(c1idx, gChain)
-        setDistanceIdx(targetIdx, oidx, 1.21)
+        var c3idx = get_cward_bb_idx(c2idx, gChain)
-        if (nWard) {
+        var pt = {0 0 0}
-             setDihedralIdx(getCwardBBidx(idx, gChain), idx, targetIdx, oidx, 0.0)
+        if ({atomIndex=targetIdx}.atomName == "CA") {
+            # Desired target location is trigonal O
+            var oidx = get_o_idx(c1idx)
+            select {atomIndex=oidx}
+            set_distance_idx(c1idx, oidx, 1.39)
+            pt = get_trigonal_idx(c2idx, c1idx, oidx, 1.41)
+             set_distance_idx(c1idx, oidx, 1.21)
          }
-         if ({atomIndex=idx}.group == "PRO") {
+         else if (({atomIndex=targetIdx}.atomName == "N")
-             repairProline(idx)
+             and ({atomIndex=targetIdx}.group != "GLY")) {
-            var dNo = {atomIndex=targetIdx}.atomno + 4
-            var dIdx = {(atomno=dNO) and (chain=gChain)}.atomIndex
+            # Desired target location is r-tetragonal CB
-            var colliders = (within(kCtolerance, FALSE, {atomIndex=dIdx})
+             var cbidx = get_cb_idx(c1idx)
-                and not connected({atomIndex=dIdx})
+            pt = get_tet_idx(cbidx, c1idx, c2idx, 1.5)
-                and not {atomIndex=dIdx})
-             for (var i = 1; i <= colliders.size; i++) {
-                if (colliders[i].atomName == "O") {
-                    counterRotate2(colliders[i].atomIndex,
-                        {atomIndex=dIdx}.xyz, targetIdx, FALSE)
-                }
-            }
          }
-    }
+        else { # C
-}
-# Rebuild Cward rotors set
+            # Save current target coords
-function tugTrackC() {
+            var cp = {atomIndex=targetIdx}.xyz
-    # For all bb atoms cWard of cargo
+            # Set target atom at desired distance and angle
-    var targetIdx = gCcargoIdx
+            select {atomIndex=targetIdx}
-    var okCount = 0
+            set_distance_idx(c1idx, targetIdx, 1.37)
+            set_angle_idx(c2idx, c1idx, targetIdx, 110.0)
-    # Allow collisions with cargo
+            if ({atomIndex=targetIdx}.group == "PRO") {
-    gOkCollide = gCargoSet
+                set_dihedral_idx(c3idx, c2idx, c1idx, targetIdx, -57.0)
-    var tcount = 0
+            }
-    while (targetIdx != gCanchorIdx) {
-        # Step to next atom
+            # Record and restore target
-        targetIdx = getCwardBBidx(targetIdx, gChain)
+            pt = {atomIndex=targetIdx}.xyz
+            {atomIndex=targetIdx}.xyz = cp
-        # No collision with cargo allowed after two atoms placed
-        if (tcount == 2) {
-           gOkCollide = ({})
          }
-        tcount++
-         # Compute targets desired coords
+         # If target not at desired location
-         var c1idx = getCwardBBidx(targetIdx, gChain)
+         if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
-        var n1idx = getNwardBBidx(targetIdx, gChain )
+            var okCount = 0
-        var n2idx = getNwardBBidx(n1Idx, gChain)
+            gTargetPt = pt
-        var n3idx = getNwardBBidx(n2Idx, gChain)
+            var xcount = 0
-        var pt = {0 0 0}
+            gOK = false
-        if ({atomIndex=targetIdx}.atomName == "N") {
+             while ((xcount < 20) and (not gOK)) {
-             var oidx = getOidx(n1idx)
-            select {atomIndex=oidx}
-            # Desired target location is trigonal O
+                 # Rotate on nWard rotor set to move it there
-            setDistanceIdx(n1idx, oidx, 1.5)
+                 tug_track_idx(targetIdx, pt, true, false)
-            pt = getTrigonal(n2idx, n1idx, oidx, 1.37)
+                 xcount++
-            setDistanceIdx(n1idx, oidx, 1.21)
-        }
-        else if (({atomIndex=targetIdx}.atomName == "C")
-            and ({atomIndex=targetIdx}.group != "GLY")) {
-            # Desired target location is tetragonal CB
-            var cbidx = getCBidx(n1idx)
-            pt = getTet(n2idx, n1idx, cbidx, 1.5)
-        }
-        else { # CA (or GLY C)
-            # Save current target coords
-            var cp = {atomIndex=targetIdx}.xyz
-            # Set target atom at desired distance and angle
-            select {atomIndex=targetIdx}
-            setDistanceIdx(n1idx, targetIdx, 1.5)
-            setAngleIdx(n2idx, n1idx, targetIdx, 120.0)
-            if ({atomIndex=targetIdx}.atomName == "CA") {
-                setDihedralIdx(n3idx, n2idx, n1idx, targetIdx, 180)
-            }
-            # Record and restore target
-            pt = {atomIndex=targetIdx}.xyz
-            {atomIndex=targetIdx}.xyz = cp
-        }
-        # If target not at desired location
-        if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
-            okCount = 0
-            gTargetPt = pt
-            var xcount = 0
-            gOK = FALSE
-            while ((xcount < 20) and (not gOK)) {
-                 # Rotate on cWard rotor set to move it there
-                 tugTrackIdx(targetIdx, pt, FALSE, FALSE)
-                    #(distance(pt, {atomIndex=targetIdx}) > kMtolerance))
-                 xcount++
              }
          }
          else {
-             gOK = TRUE
+             gOK = true
              okCount++
          }
-         # If successful
+         # If sucessful
-         if (gOK == TRUE) {
+         if (gOK == true) {
              # Adust any side atoms
-             repairSideChain(targetIdx, FALSE)
+             repair_sc(targetIdx, true)
          }
@@ Line 950: / Line 855: @@
              break
          }
-     } # endwhile (targetIdx != gCanchorIdx) {
+     }   # endwhile (targetIdx != gNanchorIdx) {
 }
-# Rebuild Nward rotors set
+# gPlicoRecord is maintained by the macro pilcoRecord
-function tugTrackN() {
+function translate_selected_record(pt) {
+    if (gPlicoRecord != "") {
+        plico_record(format("select %s;translateSelected %s;", {selected}, pt))
+    }
+    translateSelected @pt
+}
-     gOK = TRUE
+# gPlicoRecord is maintained by the macro pilcoRecord
+function rotate_selected_record(pivotIdx, caxis, a) {
+     if (gPlicoRecord != "") {
+        plico_record(format("select %s;", {selected}))
+        plico_record(format("rotateSelected {atomIndex=%d} @%s @%s;",
+            pivotIdx, caxis, a))
+    }
+    rotateSelected {atomIndex=pivotIdx} @caxis @a
+}
-     # For all bb atoms nWard of cargo
+function collect_sc_rotors(no, iChain) {
-     var targetIdx = gNcargoIdx
+     var scBondIdxs = array()
-    var okCount = 0
+     for (var iNo = no; iNo >= 0; iNo--) {
+        var ile = 0
-    # Allow collisions with cargo
+        switch ({(atomno=iNo) and (chain=iChain)
-    gOkCollide = gCargoSet
+            and thisModel}.atomName) {
-    var tcount = 0
+        case "CA" :
-    while (targetIdx != gNanchorIdx) {
+            return scBondIdxs # Early exit since break 1 appears broken
+        case "CZ" :
+            if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.group == "TYR") {
+                break
+            }
+        case "CE" :
+            if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.group == "MET") {
+                break
+            }
+        case "CG1" :
+            if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.group == "VAL") {
+                break
+            }
+            if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.group == "ILE") {
+                ile = 1
+            }
+        case "NE" :
+        case "CD" :
+        case "SD" :
+        case "CG" :
+        case "CB" :
+            scBondIdxs += {(atomno=@{iNo+1+ile}) and (chain=iChain)
+                and thisModel}.atomIndex
+            scBondIdxs += {(atomno=@{iNo+0}) and (chain=iChain)
+                and thisModel}.atomIndex
+            if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.atomName%2 == "CG") {
+                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)
+                    and thisModel}.atomIndex
+                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)
+                    and thisModel}.atomIndex
+            }
+            else if ({(atomno=iNo) and (chain=iChain)
+                and thisModel}.atomName == "CB") {
+                scBondIdxs += {(atomno=@{iNo-3}) and (chain=iChain)
+                    and thisModel}.atomIndex
+                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)
+                    and thisModel}.atomIndex
+            }
+            else {
+                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)
+                    and thisModel}.atomIndex
+                scBondIdxs += {(atomno=@{iNo-2}) and (chain=iChain)
+                    and thisModel}.atomIndex
+            }
+            break
+        }
-        # Step to next atom
+    }
-        targetIdx = getNwardBBidx(targetIdx, gChain)
-        # No collision with cargo allowed after two atoms placed
+    return scBondIdxs
-        if (tcount == 2) {
+}
-           gOkCollide = ({})
-        }
-        tcount++
-        # Compute targets desired coords
+# Drag Side Chain
-        var n1idx = getNwardBBidx(targetIdx, gChain)
+function drag_sc() {
-        var c1idx = getCwardBBidx(targetIdx, gChain)
+    var iNo = {atomIndex=gSCidx}.atomno
-        var c2idx = getCwardBBidx(c1idx, gChain)
+    var iChain  = {atomIndex=gSCidx}.chain
-        var c3idx = getCwardBBidx(c2idx, gChain)
+    if ({atomIndex=gSCidx}.group != "PRO") {
-        var pt = {0 0 0}
-        if ({atomIndex=targetIdx}.atomName == "CA") {
-            # Desired target location is trigonal O
+        var scBondIdxs = collect_sc_rotors( iNo, iChain)
-            var oidx = getOidx(c1idx)
+        var numChi = scBondIdxs.size / 4
-            select {atomIndex=oidx}
+         var dist = distance({atomIndex=gSCidx}.xyz, gSCpt)
-            setDistanceIdx(c1idx, oidx, 1.39)
+        var scSet = get_sc_set(gSCidx, iChain)
-            pt = getTrigonal(c2idx, c1idx, oidx, 1.41)
-            setDistanceIdx(c1idx, oidx, 1.21)
-         }
-        else if (({atomIndex=targetIdx}.atomName == "N")
-            and ({atomIndex=targetIdx}.group != "GLY")) {
-            # Desired target location is r-tetragonal CB
+        # For all rotor combinations
-            var cbidx = getCBidx(c1idx)
+        var dh = array()
-             pt = getTet(cbidx, c1idx, c2idx, 1.5)
+        for (var i = 0; i < numChi; i++) {
-         }
+             dh += angle({atomIndex=@{scBondIdxs[4+(4*i)]}},
-         else { # C
+                {atomIndex=@{scBondIdxs[3+(4*i)]}},
+                {atomIndex=@{scBondIdxs[2+(4*i)]}},
+                {atomIndex=@{scBondIdxs[1+(4*i)]}})
+         }
+         for (var i = 0; i < numChi; i++) {
+            var rot = -120
+            for (var j = 0; j < 6; j++) {
+                rot += 60*j
+                select_add_sc(scBondIdxs[1+(4*i)])
+                set_dihedral_idx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
+                    scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], rot)
+                var newDist = distance({atomIndex=gSCidx}.xyz, gSCpt)
+                if (gSCcheck) {
+                    var colliders = (within(kCtolerance, false, scSet)
+                        and not connected(scSet) and not {scSet})
+                    if (colliders) {
+                        continue
+                    }
+                }
-            # Save current target coords
+                # Find the best
-            var cp = {atomIndex=targetIdx}.xyz
+                if (newDist < dist) {
+                    dist = newDist
-            # Set target atom at desired distance and angle
+                    for (var k = 0; k < numChi; k++) {
-            select {atomIndex=targetIdx}
+                        dh[k+1] = angle({atomIndex=@{scBondIdxs[4+(4*k)]}},
-            setDistanceIdx(c1idx, targetIdx, 1.37)
+                        {atomIndex=@{scBondIdxs[3+(4*k)]}},
-            setAngleIdx(c2idx, c1idx, targetIdx, 110.0)
+                        {atomIndex=@{scBondIdxs[2+(4*k)]}},
+                        {atomIndex=@{scBondIdxs[1+(4*k)]}})
-            if ({atomIndex=targetIdx}.group == "PRO") {
+                    }
-                setDihedralIdx(c3idx, c2idx, c1idx, targetIdx, -57.0)
+                }
-            }
+             }
-            # Record and restore target
-            pt = {atomIndex=targetIdx}.xyz
-             {atomIndex=targetIdx}.xyz = cp
          }
-         # If target not at desired location
+         # Now set the best
-         if (distance(pt, {atomIndex=targetIdx}) > kDtolerance) {
+         for (var i = 0; i < numChi; i++) {
-             var okCount = 0
+             select_add_sc(scBondIdxs[1+(4*i)])
-            gTargetPt = pt
+             set_dihedral_idx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
-             var xcount = 0
+                 scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], dh[i+1])
-            gOK = FALSE
-            while ((xcount < 20) and (not gOK)) {
-                 # Rotate on cWard rotor set to move it there
-                tugTrackIdx(targetIdx, pt, TRUE, FALSE)
-                    #(distance(pt, {atomIndex=targetIdx}) > kMtolerance))
-                xcount++
-            }
          }
-         else {
-            gOK = TRUE
+        if (gSCcheck = false) {
-             okCount++
+             plico_minimize( scSet)
          }
+    }
+    else { # PRO - toggle between puckers up and down
+        var icd = {(atomno=@{iNo+1}) and (chain=iChain)
+            and thisModel}.atomIndex
+        var icb = {(atomno=@{iNo-1}) and (chain=iChain)
+            and thisModel}.atomIndex
+        var ica = {(atomno=@{iNo-4}) and (chain=iChain)
+            and thisModel}.atomIndex
+        var in = {(atomno=@{iNo-5}) and (chain=iChain)
+            and thisModel}.atomIndex
+        select {atomIndex=gSCidx}
-        # If sucessful
+         if (angle({atomIndex=ica}, {atomIndex=in},
-         if (gOK == TRUE) {
+            {atomIndex=icd}, {atomIndex=gSCidx}) < -10.0) {
+            set_dihedral_idx(ica, in, icd, gSCidx, 8.7)
-             # Adust any side atoms
+             set_angle_idx(in, icd, gSCidx, 110.0)
-             repairSideChain(targetIdx, TRUE)
+             set_distance_idx(icd, gSCidx, 1.5)
          }
-        # Else fail
          else {
-             break
+             set_dihedral_idx(ica, in, icd, gSCidx, -29.5)
+            set_angle_idx(in, icd, gSCidx, 108.8)
+            set_distance_idx(icd, gSCidx, 1.5)
          }
+    }
-        # If no movement in 4 tries, we are done
+    draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
-        if (okCount > 3) {
+     gSCpt = {atomIndex=gSCidx}.xyz
-            break
-        }
-     }   # endwhile (targetIdx != gNanchorIdx) {
 }
-# gPlicoRecord is maintained by the macro pilcoRecord
+# Fix side chain collisions
-function plicoRecord(s) {
+function fix_sc_collision_2(idx) {
-     var g = format("show file \"%s\"", gPlicoRecord)
+    gOk2 = false
-     var ls = script(g)
+    var iNo = {atomIndex=idx}.atomno
-     if (ls.find("FileNotFoundException")) {
+     var iChain = {atomIndex=idx}.chain
-         ls = ""
+     var resno = {(atomno=iNo) and (chain=iChain)
+        and thisModel}.resno
+    # Get SC terminus
+     while (resno == {(atomno=iNo) and (chain=iChain)
+        and thisModel}.resno) {
+         iNo++
      }
-     ls += s
+     iNo--
-    write var ls @gPlicoRecord
-}
-# gPlicoRecord is maintained by the macro pilcoRecord
+    var sc = array()
-function translateSelectedRecord(pt) {
+     var iBno = iNo
-     if (gPlicoRecord != "") {
+    while ({(atomno=iBno) and (chain=iChain)
-         plicoRecord(format("select %s;translateSelected %s;", {selected}, pt))
+        and thisModel}.atomName != "CB") {
+         sc += {(atomno=iBno) and (chain=iChain)
+            and thisModel}
+        iBno--
      }
-     translateSelected @pt
+     var cbidx = {(atomno=iBno) and (chain=iChain)
-}
+        and thisModel}.atomIndex
-# gPlicoRecord is maintained by the macro pilcoRecord
+     var scBondIdxs = collect_sc_rotors( iNo, iChain)
-function rotateSelectedRecord(g1pivotIdx, axis, a) {
+     var numChi = scBondIdxs.size / 4
-     if (gPlicoRecord != "") {
-        plicoRecord(format("select %s;", {selected}))
-        plicoRecord(format("rotateSelected {atomIndex=%d} @%s @%s;",
-            g1pivotIdx, axis, a))
-     }
-    rotateSelected {atomIndex=g1pivotIdx} @axis @a
-}
-function collectSCrotors(no, iChain) {
+    # For all rotor combinations
-    var scBondIdxs = array()
+    for (var i = 0; i < numChi; i++) {
-    for (var iNo = no; iNo >= 0; iNo--) {
+        var rot = -120
-        var ile = 0
+        for (var j = 0; j < 6; j++) {
-        switch ({(atomno=iNo) and (chain=iChain)}.atomName) {
+            rot += 60
-        case "CA" :
+            select_add_sc(scBondIdxs[1+(4*i)])
-             return scBondIdxs # Early exit since break 1 appears broken
+            set_dihedral_idx(scBondIdxs[1+(4*i)], scBondIdxs[2+(4*i)],
-        case "CZ" :
+                scBondIdxs[3+(4*i)], scBondIdxs[4+(4*i)], rot)
-             if ({(atomno=iNo) and (chain=iChain)}.group == "TYR") {
-                 break
+             # If no collision, exit
+             var colliders = (within(kCtolerance, false, {sc})
+                and not {atomIndex=cbidx} and not {sc})
+            # If it is with water, delete the water
+            for (var c = 1; c < colliders.size; c++ ) {
+                if (colliders[c].group = "HOH") {
+                    delete {atomIndex=@{colliders[c].atomIndex}}
+                    colliders = {colliders and not @{colliders[c]}}
+                 }
              }
-        case "CE" :
-             if ({(atomno=iNo) and (chain=iChain)}.group == "MET") {
+             if (colliders.size == 0) {
-                 break
+                 gOk2 = true
+                return # Early exit since break 1 appears broken
              }
-        case "CG1" :
-            if ({(atomno=iNo) and (chain=iChain)}.group == "VAL") {
-                break
-            }
-            if ({(atomno=iNo) and (chain=iChain)}.group == "ILE") {
-                ile = 1
-            }
-        case "NE" :
-        case "CD" :
-        case "SD" :
-        case "CG" :
-        case "CB" :
-            scBondIdxs += {(atomno=@{iNo+1+ile}) and (chain=iChain)}.atomIndex
-            scBondIdxs += {(atomno=@{iNo+0}) and (chain=iChain)}.atomIndex
-            if ({(atomno=iNo) and (chain=iChain)}.atomName%2 == "CG") {
-                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)}.atomIndex
-                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)}.atomIndex
-            }
-            else if ({(atomno=iNo) and (chain=iChain)}.atomName == "CB") {
-                scBondIdxs += {(atomno=@{iNo-3}) and (chain=iChain)}.atomIndex
-                scBondIdxs += {(atomno=@{iNo-4}) and (chain=iChain)}.atomIndex
-            }
-            else {
-                scBondIdxs += {(atomno=@{iNo-1}) and (chain=iChain)}.atomIndex
-                scBondIdxs += {(atomno=@{iNo-2}) and (chain=iChain)}.atomIndex
-            }
-            break
-        }
+        }
+    }
+}
+function is_moveable_sc(aIdx) {
+    var ret = (({atomIndex=aIdx}.group != "PRO")
+        or ({atomIndex=aIdx}.atomName == "CG"))
+    switch({atomIndex=aIdx}.atomName) {
+    case "N":
+    case "CA":
+    case "C":
+    case "CB":
+    case "O":
+    case "O4\'":
+        ret = false
+        break
      }
+    return ret
+}
-     return scBondIdxs
+function is_rotor_avail(i1idx, i2idx) {
-}
+    var ret = true
+     if (i1idx > i2idx) { # frozen bonds are kept as lo-hi
+        var idx = @i1idx
+        i1idx = @i2idx
+        i2idx = @idx
+    }
-# Drag Side Chain
+    for (var i = 1; i <= gFreeze.size; i += 2) {
-function dragSC() {
+        if ((gFreeze[i] == i1idx) and (gFreeze[i+1] == i2idx)) {
+            ret = false
+            break
+        }
+    }
-     var iNo = {atomIndex=gSCidx}.atomno
+     return ret
-    var iChain  = {atomIndex=gSCidx}.chain
+}
-     if ({atomIndex=gSCidx}.group != "PRO") {
+function xcollect_bb_rotors(nWard) {
+     var anchorNo = (nWard
+        ? ((gNanchorIdx >= 0) ? {atomIndex=gNanchorIdx}.atomno : gMinNo)
+        : ((gCanchorIdx >= 0) ? {atomIndex=gCanchorIdx}.atomno : gMaxNo))
+    var cargoNo = (nWard
+        ? ((gNcargoIdx >= 0) ? {atomIndex=gNcargoIdx}.atomno
+        : {atomIndex=gCcargoIdx}.atomno)
+        : {atomIndex=gCcargoIdx}.atomno)
+    var rotors = array()
+    if (cargoNo < anchorNo) {
-         var scBondIdxs = collectSCrotors( iNo, iChain)
+         for (var iNo = cargoNo; iNo <= anchorNo; iNo++) {
-        var numChi = scBondIdxs.size / 4
+            if ({(atomno=iNo) and (chain=gChain)
-        var dist = distance({atomIndex=gSCidx}.xyz, gSCpt)
+                and thisModel}.atomName == "CA") {
+                if (is_rotor_avail(iNo)) {# xxx
+                    if (({(atomno=iNo) and (chain=gChain)
+                        and thisModel}.group != "PRO") and (iNo > cargoNo)) { # phi
+                        rotors += [{(atomno=@{get_cm_no(iNo-1)}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo-1}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                        rotors += [{(atomno=@{iNo}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo+1}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                    }
+                    if (iNo != (anchorNo-1)) { # psi
+                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                        rotors += [{(atomno=@{iNo+1}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{get_np_no(iNo+2)}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                    }
+                }
+            }
+        }
+    }
+    else {
-         var scSet = ({})
+         for (var iNo = cargoNo; iNo >= anchorNo; iNo--) {
-        if (gSCcheck) {
+            if ({(atomno=iNo) and (chain=gChain)
-            scSet = getScSet(gSCidx, iChain)
+                and thisModel}.atomName == "CA") {
+                if (is_rotor_avail(iNo)) {
+                    if ((iNo != (anchorNo-1)) and (iNo < cargoNo)) { # psi
+                        rotors += [{(atomno=@{get_np_no(iNo+2)}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo+1}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                        rotors += [{(atomno=@{iNo}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo-1}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                    }
+                    if ({(atomno=iNo) and (chain=gChain)
+                        and thisModel}.group != "PRO") { # phi
+                        rotors += [{(atomno=@{iNo+1}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{iNo}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)
+                            and thisModel}.atomIndex,
+                            {(atomno=@{get_cm_no(iNo-1)}) and (chain=gChain)
+                                and thisModel}.atomIndex]
+                    }
+                }
+            }
          }
+    }
-         # For all rotor combinations
-         var dh = array()
+    if (nWard) {
-         for (var i = 0; i < numChi; i++) {
+         gNrotors = rotors
-            dh += angle({atomIndex=@{scBondIdxs[4+(4*i)]}},
+    }
-                {atomIndex=@{scBondIdxs[3+(4*i)]}},
+    else {
-                {atomIndex=@{scBondIdxs[2+(4*i)]}},
+         gCrotors = rotors
-                {atomIndex=@{scBondIdxs[1+(4*i)]}})
+    }
-         }
+}
-         for (var i = 0; i < numChi; i++) {
+function collect_bb_rotors(nWard) {
-             var rot = -120
+    if (nWard) {
-             for (var j = 0; j < 6; j++) {
+         gNrotors = array()
-                rot += 60*j
+         var nres = {atomIndex=gNcargoIdx}.resno
-                selectAddSideChain(scBondIdxs[1+(4*i)])
+        var nname = {atomIndex=gNcargoIdx}.atomName
-                 setDihedralIdx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
+        var ares = get_resno_min(gChain)
-                    scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], rot)
+        var aA = get_atom_rcn( ares, gChain, "N")
-                 var newDist = distance({atomIndex=gSCidx}.xyz, gSCpt)
+        if (gNanchorIdx >= 0) {
-                 if (gSCcheck) {
+            aA = {atomIndex=gNanchorIdx}
-                     var colliders = (within(kCtolerance, FALSE, scSet)
+        }
-                        and not connected(scSet) and not {scSet})
+         var aname = aA.atomName
-                     if (colliders.size > 0) {
+         for (var r = nres; r >= ares; r--) {
-                        continue
+             var aCp = get_atom_rcn( r-1, gChain, "C")
-                     }
+             var aN = get_atom_rcn( r, gChain, "N")
+            var aCa = get_atom_rcn( r, gChain, "CA")
+            var aC = get_atom_rcn( r, gChain, "C")
+            var aNn = get_atom_rcn( r+1, gChain, "N")
+            if (aCp.size < 1) {
+                 aCp = aNn
+            }
+            # psi
+            if (((r < nres) and (r > ares))
+                or ((r == nres) and (nname == "C"))
+                 or ((r == ares) and (aname != "C"))) {
+                 if (is_rotor_avail(aCa.atomIndex, aC.atomIndex)) {
+                     gNrotors += aNn.atomIndex
+                    gNrotors += aC.atomIndex
+                     gNrotors += aCa.atomIndex
+                     gNrotors += aN.atomIndex
                  }
+            }
-                # Find the best
-                 if (newDist < dist) {
+            # phi
-                     dist = newDist
+            if (aCa.group != "PRO") {
-                     for (var k = 0; k < numChi; k++) {
+                 if (((r <= nres) and (r > ares))
-                         dh[k+1] = angle({atomIndex=@{scBondIdxs[4+(4*k)]}},
+                     or ((r == ares) and (aname == "N"))) {
-                         {atomIndex=@{scBondIdxs[3+(4*k)]}},
+                     if (is_rotor_avail(aCa.atomIndex, aN.atomIndex)) {
-                         {atomIndex=@{scBondIdxs[2+(4*k)]}},
+                         gNrotors += aC.atomIndex
-                         {atomIndex=@{scBondIdxs[1+(4*k)]}})
+                         gNrotors += aCa.atomIndex
+                         gNrotors += aN.atomIndex
+                         gNrotors += aCp.atomIndex
                      }
                  }
              }
-         }
+         } # endfor
-        # Now set the best
-        for (var i = 0; i < numChi; i++) {
-            selectAddSideChain(scBondIdxs[1+(4*i)])
-            setDihedralIdx(scBondIdxs[4+(4*i)], scBondIdxs[3+(4*i)],
-                scBondIdxs[2+(4*i)], scBondIdxs[1+(4*i)], dh[i+1])
-        }
      }
-     else { # PRO - toggle between puckers up and down
+     else {
-         var icd = {(atomno=@{iNo+1}) and (chain=iChain)}.atomIndex
+         gCrotors = array()
-         var icb = {(atomno=@{iNo-1}) and (chain=iChain)}.atomIndex
+         var cres = {atomIndex=gCcargoIdx}.resno
-         var ica = {(atomno=@{iNo-4}) and (chain=iChain)}.atomIndex
+         var cname = {atomIndex=gCcargoIdx}.atomName
-         var in = {(atomno=@{iNo-5}) and (chain=iChain)}.atomIndex
+         var ares = get_resno_max(gChain)
-         select {atomIndex=gSCidx}
+         var aA = get_atom_rcn( ares, gChain, "C")
+         if (gCanchorIdx >= 0) {
-         if (angle({atomIndex=ica}, {atomIndex=in},
+             aA = {atomIndex=gCanchorIdx}
-             {atomIndex=icd}, {atomIndex=gSCidx}) < -10.0) {
-            setDihedralIdx(ica, in, icd, gSCidx, 8.7)
-            setAngleIdx(in, icd, gSCidx, 110.0)
-            setDistanceIdx(icd, gSCidx, 1.5)
-        }
-        else {
-            setDihedralIdx(ica, in, icd, gSCidx, -29.5)
-            setAngleIdx(in, icd, gSCidx, 108.8)
-            setDistanceIdx(icd, gSCidx, 1.5)
          }
+        var aname = aA.atomName
+        for (var r = cres; r <= ares; r++) {
+            var aCp = get_atom_rcn( r-1, gChain, "C")
+            var aN = get_atom_rcn( r, gChain, "N")
+            var aCa = get_atom_rcn( r, gChain, "CA")
+            var aC = get_atom_rcn( r, gChain, "C")
+            var aNn = get_atom_rcn( r+1, gChain, "N")
+            if (aNn.size < 1) {
+                aNn = aCp
+            }
+            # phi
+            if (aCa.group != "PRO") {
+                if (((r > cres) and (r < ares))
+                    or ((r == cres) and (aname == "N"))
+                    or ((r == ares) and (aname != "N"))) {
+                    if (is_rotor_avail(aN.atomIndex, aCa.atomIndex)) {
+                        gCrotors += aCp.atomIndex
+                        gCrotors += aN.atomIndex
+                        gCrotors += aCa.atomIndex
+                        gCrotors += aC.atomIndex
+                    }
+                }
+            }
+            # psi
+            if (((r >= cres) and (r < ares))
+                or ((r == cres) and (aname != "C"))
+                or ((r == ares) and (aname == "C"))) {
+                if (is_rotor_avail(aCa.atomIndex, aC.atomIndex)) {
+                    gCrotors += aN.atomIndex
+                    gCrotors += aCa.atomIndex
+                    gCrotors += aC.atomIndex
+                    gCrotors += aNn.atomIndex
+                }
+            }
+        } # endfor
      }
+}
-     draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
+function collect_rotors() {
-     gSCpt = {atomIndex=gSCidx}.xyz
+     collect_bb_rotors(false)
+     collect_bb_rotors(true)
 }
-# Fix side chain collisions
+function tug_sc(pt) {
-function fixSCcollision2(idx) {
-    gOk2 = FALSE
-    var iNo = {atomIndex=idx}.atomno
-    var iChain = {atomIndex=idx}.chain
-    var resno = {(atomno=iNo) and (chain=iChain)}.resno
-     # Get SC terminus
+     # If destination atom defined
-     while (resno == {(atomno=iNo) and (chain=iChain)}.resno) {
+     if (gDestAtomIdx >= 0) {
-         iNo++
+        var v = {atomIndex=gDestAtomIdx}.xyz - {atomIndex=gSCidx}.xyz
+        if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
+            pt = -v/20.0
+         }
+        else {
+            pt = v/20.0
+        }
      }
-     iNo--
+     gSCpt += pt
+    draw arrow {atomIndex=gSCidx} @gSCpt
+}
-     var sc = array()
+function set_colors() {
-     var iBno = iNo
+     select (thisModel)
-     while ({(atomno=iBno) and (chain=iChain)}.atomName != "CB") {
+     color {selected} @gScheme
-         sc += {(atomno=iBno) and (chain=iChain)}
+    color {atomIndex=g1pivotIdx} green
-        iBno--
+     color {atomIndex=g2pivotIdx} green
-     }
+    color @gCargoSet @gAltScheme
-     var cbidx = {(atomno=iBno) and (chain=iChain)}.atomIndex
+    color {gCargoSet and oxygen} pink
+    select {(atomIndex=gCcargoIdx) or (atomIndex=gNcargoIdx)
-     var scBondIdxs = collectSCrotors( iNo, iChain)
+         or (atomIndex=gCanchorIdx) or (atomIndex=gNanchorIdx)}
-    var numChi = scBondIdxs.size / 4
+     halo on
+     select {atomIndex=gDestAtomIdx}
+    star on
+     select none
+}
-    # For all rotor combinations
+function clear_atom_idxs() {
-    for (var i = 0; i < numChi; i++) {
+    gCcargoIdx = -1
-        var rot = -120
+    gNcargoIdx = -1
-        for (var j = 0; j < 6; j++) {
+    gCanchorIdx = -1
-            rot += 60
+    gNanchorIdx = -1
-            selectAddSideChain(scBondIdxs[1+(4*i)])
+    g1pivotIdx = -1
-            setDihedralIdx(scBondIdxs[1+(4*i)], scBondIdxs[2+(4*i)],
+    g2pivotIdx = -1
-                scBondIdxs[3+(4*i)], scBondIdxs[4+(4*i)], rot)
+    g1dynamicIdx = -1
+    g2dynamicIdx = -1
-            # If no collision, exit
+    gDestAtomIdx = -1
-            colliders = (within(kCtolerance, FALSE, {sc})
+    gSCidx = -1
-                and not {atomIndex=cbidx} and not {sc})
+}
-            # If it is with water, delete the water
-            for (var c = 1; c < colliders.size; c++ ) {
-                if (colliders[c].group = "HOH") {
-                    delete {atomIndex=@{colliders[c].atomIndex}}
-                    colliders = {colliders and not @{colliders[c]}}
-                }
-            }
-            if (colliders.size == 0) {
-                gOk2 = TRUE
-                return # Early exit since break 1 appears broken
-            }
+function timed_out (s) {
+    timeout ID"tug" OFF
+    refresh
+    if (prompt(format("%s - Undo?", s), "Yes|No", true) == "Yes") {
+        gBusy = false
+        restore state gState
+        connect
+        select gCargoSet
+        set bondPicking true
+        refresh
+        for (var i = 1; i <= gFreeze.size; i+=2) {
+            select {atomIndex=@{gFreeze[i]}} or {atomIndex=@{gFreeze[i+1]}}
+            color bonds lightblue
          }
+        background ECHO yellow
+        echo @gEcho
+        select all
+        quit
      }
 }
-function isMovableSideChain(aIdx) {
+function record_drag() {
+     var ls = format("select %s;", {selected})
-     var ret = (({atomIndex=aIdx}.group != "PRO")
+    ls += format("gCanchorIdx = %d;", gCanchorIdx)
-        or ({atomIndex=aIdx}.atomName == "CG"))
+    ls += format("gCanchorNo = %d;", gCanchorNo)
-     switch({atomIndex=aIdx}.atomName) {
+    ls += format("gNanchorIdx = %d;", gNanchorIdx)
-     case "N":
+    ls += format("gNanchorNo = %d;", gNanchorNo)
-     case "CA":
+    ls += format("gCcargoIdx = %d;", gCcargoIdx)
-     case "C":
+    ls += format("gNcargoIdx = %d;", gNcargoIdx)
-     case "CB":
+     ls += format("gCcargoNo = %d;", gCcargoNo)
-     case "O":
+     ls += format("gNcargoNo = %d;", gNcargoNo)
-     case "O4\'":
+     ls += format("gDestAtomIdx = %d;", gDestAtomIdx)
-        ret = FALSE
+     ls += format("g1pivotIdx = %d;", g1pivotIdx)
-        break
+     ls += format("g2pivotIdx = %d;", g2pivotIdx)
-     }
+     ls += format("gOkCollide = %s;", gOkCollide)
-     return ret
+     ls += format("gChain = \"%s\";", gChain)
+    ls += format("gMinNo = %d;", gMinNo)
+    ls += format("gMaxNo = %d;", gMaxNo)
+    ls += format("gCargoSet = %s;", gCargoSet)
+    ls += format("gSCidx = %d;", gSCidx)
+    ls += format("gSCcircle = %d;", gSCcircle)
+    ls += format("gSCpt = %s;", gSCpt)
+    ls += "collect_rotors();"
+     ls += "tug_drag_done_mb();"
+     plico_record(ls)
 }
-# gFreeze is maintained by the script plicoFreeze that allows the user
+# Pick call-back for freeze
-# to inhibit rotation on selected rotors
+function tug_pick_cb() {
-function isRotorAvailable(idx) {
+     if (_pickInfo[3][6] == "bond") {
-     return (gFreeze.find(idx) == 0)
+        var sel = {selected}
-}
+        var i = _pickInfo.find(":")
+        var iChain = _pickInfo[i+1]
+        i = _pickInfo.find("#")
+        var a1no = 0 + _pickInfo[i+1][i+3]
+        var j = _pickInfo[i+1][9999].find("#")
+        var a2no = 0 + _pickInfo[i+j+1][i+j+3]
+        var i1idx = {(atomno=a1no) and (chain=iChain)
+            and thisModel}.atomIndex
+        var i2idx = {(atomno=a2no) and (chain=iChain)
+            and thisModel}.atomIndex
+        if (({atomIndex=i1idx}.atomName == "CA")
+            or ({atomIndex=i2idx}.atomName == "CA")) {
+            if (({atomIndex=i1idx}.atomName != "CB")
+                and ({atomIndex=i2idx}.atomName != "CB")) {
+                if (i1idx > i2idx) {
+                    var idx = 0 + i1idx
+                    i1idx = 0 + i2idx
+                    i2idx = 0 + idx
+                }
+                select {atomIndex=i1idx} or {atomIndex=i2idx}
-function collectBBrotors(nWard) {
+                for (i = 1; i <= gFreeze.size; i += 2) {
-    var anchorNo = (nWard
+                    if ((gFreeze[i] == i1idx) and (gFreeze[i+1] == i2idx)) {
-        ? ((gNanchorIdx >= 0) ? {atomIndex=gNanchorIdx}.atomno : gMinNo)
+                        if (i > 1) {
-        : ((gCanchorIdx >= 0) ? {atomIndex=gCanchorIdx}.atomno : gMaxNo))
+                            if (gFreeze.size = (i+1)) {
-    var cargoNo = (nWard
+                                gFreeze = gFreeze[1][i-1]
-        ? ((gNcargoIdx >= 0) ? {atomIndex=gNcargoIdx}.atomno
+                            }
-        : {atomIndex=gCcargoIdx}.atomno)
+                             else {
-        : {atomIndex=gCcargoIdx}.atomno)
+                                gFreeze = gFreeze[1][i-1] + gFreeze[i+2][0]
-    var rotors = array()
+                             }
-    if (cargoNo < anchorNo) {
+                        }
+                         else {
-        for (var iNo = cargoNo; iNo <= anchorNo; iNo++) {
+                             gFreeze = gFreeze[i+2][0]
-            if ({(atomno=iNo) and (chain=gChain)}.atomName == "CA") {
+                        }
-                if (isRotorAvailable(iNo)) {
+                        color bonds NONE
-                    if (({(atomno=iNo) and (chain=gChain)}.group != "PRO") and (iNo > cargoNo)) { # phi
+                        i = 0
-                        rotors += [{(atomno=@{getCmNo(iNo-1)}) and (chain=gChain)}.atomIndex,
+                        break
-                            {(atomno=@{iNo-1}) and (chain=gChain)}.atomIndex]
-                        rotors += [{(atomno=@{iNo}) and (chain=gChain)}.atomIndex,
-                             {(atomno=@{iNo+1}) and (chain=gChain)}.atomIndex]
-                    }
-                    if (iNo != (anchorNo-1)) { # psi
-                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)}.atomIndex,
-                             {(atomno=@{iNo}) and (chain=gChain)}.atomIndex]
-                         rotors += [{(atomno=@{iNo+1}) and (chain=gChain)}.atomIndex,
-                             {(atomno=@{getNpNo(iNo+2)}) and (chain=gChain)}.atomIndex]
                      }
+                }
+                if (i > gFreeze.size) {
+                    gFreeze += i1idx
+                    gFreeze += i2idx
+                    color bonds lightblue
                  }
              }
          }
+        select {sel}
      }
-    else {
+}
-        for (var iNo = cargoNo; iNo >= anchorNo; iNo--) {
+# Bound to LEFT-UP by tug_enable_drag
-            if ({(atomno=iNo) and (chain=gChain)}.atomName == "CA") {
+function tug_drag_done_mb() {
-                if (isRotorAvailable(iNo)) {
+    if (not gBusy) {
-                    if ((iNo != (anchorNo-1)) and (iNo < cargoNo)) { # psi
+        if (gPlicoRecord != "") {
-                        rotors += [{(atomno=@{getNpNo(iNo+2)}) and (chain=gChain)}.atomIndex,
+            record_drag()
-                            {(atomno=@{iNo+1}) and (chain=gChain)}.atomIndex]
+         }
-                        rotors += [{(atomno=@{iNo}) and (chain=gChain)}.atomIndex,
-                            {(atomno=@{iNo-1}) and (chain=gChain)}.atomIndex]
-                    }
-                    if ({(atomno=iNo) and (chain=gChain)}.group != "PRO") { # phi
-                        rotors += [{(atomno=@{iNo+1}) and (chain=gChain)}.atomIndex,
-                            {(atomno=@{iNo}) and (chain=gChain)}.atomIndex]
-                        rotors += [{(atomno=@{iNo-1}) and (chain=gChain)}.atomIndex,
-                            {(atomno=@{getCmNo(iNo-1)}) and (chain=gChain)}.atomIndex]
-                    }
-                }
-            }
-         }
-    }
-    if (nWard) {
+        # Move by rotation on rotor sets, smallest first
-         gNrotors = rotors
+         gBusy = true
-    }
+        background ECHO pink
-    else {
+         refresh
-         gCrotors = rotors
-    }
-}
-function collectRotors() {
+        # If side chain mode
-    collectBBrotors(FALSE)
+        if (gSCidx >= 0) {
-    collectBBrotors(TRUE)
+            drag_sc()
-}
+        }
-function tugSideChain(pt) {
+        # Else
+        else if (not gTow) {
-    # If destination atom defined
+            gOK = true
-    if (gDestAtomIdx >= 0) {
+            timeout ID"tug" 20.0 "timed_out(\"Tug timed out\")"
-        var v = {atomIndex=gDestAtomIdx}.xyz - {atomIndex=gSCidx}.xyz
+            if ((gCrotors.size < gNrotors.size) or (gNanchorIdx < 0)) {
-        if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
+                if (gCrotors.size > 4) {
-             pt = -v/20.0
+                    tug_track_c()
-        }
+                }
-        else {
+                if (gOK and (gNrotors.size > 4)) {
-            pt = v/20.0
+                    tug_track_n()
-        }
+                }
-    }
+             }
-    gSCpt += pt
+            else {
-    draw arrow {atomIndex=gSCidx} @gSCpt
+                if (gNrotors.size > 4) {
-}
+                    tug_track_n()
+                }
+                if (gOK and (gCrotors.size > 4)) {
+                    tug_track_c()
+                }
+            }
+            timeout ID"tug" OFF
-function setColors() {
+            # If anchor angles acute, fail
-    select all
+            if (gOK == true) {
-    color {selected} @gScheme
+                if (gCanchorIdx >= 0) {
-    color {atomIndex=g1pivotIdx} green
+                    var ic = get_cward_bb_idx(gCanchorIdx, gChain)
-    color {atomIndex=g2pivotIdx} green
+                    var in = get_nward_bb_idx(gCanchorIdx, gChain)
-    color @gCargoSet @gAltScheme
+                    if ((ic >= 0) and
-    select {(atomIndex=gCcargoIdx) or (atomIndex=gNcargoIdx)
+                        angle({atomIndex=ic}, {atomIndex=gCanchorIdx}, {atomIndex=in})
-        or (atomIndex=gCanchorIdx) or (atomIndex=gNanchorIdx)}
+                        < 100.0) {
-    halo on
+                        gOK = false
-    select {atomIndex=gDestAtomIdx}
+                    }
-    star on
+                }
-    select none
+                if (gNanchorIdx >= 0) {
-}
+                    var ic = get_cward_bb_idx(gNanchorIdx, gChain)
+                    var in = get_nward_bb_idx(gNanchorIdx, gChain)
+                    if ((in >= 0) and
+                        angle({atomIndex=ic}, {atomIndex=gNanchorIdx}, {atomIndex=in})
+                        < 100.0) {
+                        gOK = false
+                    }
+                }
+            }
-function clearAtomIdxs() {
+            # If too far
-    gCcargoIdx = -1
+            if (not gOK) {
-    gNcargoIdx = -1
+                timed_out("TUG TOO FAR!")
-    gCanchorIdx = -1
+            }
-    gNanchorIdx = -1
-    g1pivotIdx = -1
+            # Else OK
-    g2pivotIdx = -1
+            else {
-    g1dynamicIdx = -1
-    g2dynamicIdx = -1
+                var idx = {
-    gDestAtomIdx = -1
+                    (atomno=@{{(chain=gChain) and thisModel}.atomno.min})
-    gSCidx = -1
+                    and (chain=gChain) and thisModel}.atomIndex
-}
-function timedOut (s) {
-    timeout ID"tug" OFF
-    prompt(s)
-    gBusy = FALSE
-    background ECHO yellow
-    restore state gState
-    select gCargoSet
-    refresh
-    quit
-}
-function recordDrag() {
+                var ihc = 0
-    var ls = format("select %s;", {selected})
+                for (ihc = 0; ihc < 10; ihc++) {
-    ls += format("gCanchorIdx = %d;", gCanchorIdx)
+                    select ((atomno >= gNanchorNo) and (atomno <= gCanchorNo)
-    ls += format("gCanchorNo = %d;", gCanchorNo)
+                        and (chain = gChain) and thisModel)
-    ls += format("gNanchorIdx = %d;", gNanchorIdx)
+                    handle_collisions( idx)
-    ls += format("gNanchorNo = %d;", gNanchorNo)
+                    if (count_collisions(({})).size == 0) {
-    ls += format("gCcargoIdx = %d;", gCcargoIdx)
+                        break
-    ls += format("gNcargoIdx = %d;", gNcargoIdx)
+                    }
-    ls += format("gCcargoNo = %d;", gCcargoNo)
+                }
-    ls += format("gNcargoNo = %d;", gNcargoNo)
+                if (ihc == 10) {
-    ls += format("gDestAtomIdx = %d;", gDestAtomIdx)
+                    timed_out("Unable to handle all collisions!")
-    ls += format("g1pivotIdx = %d;", g1pivotIdx)
+                }
-    ls += format("g2pivotIdx = %d;", g2pivotIdx)
+            }
-    ls += format("gOkCollide = %s;", gOkCollide)
+        }
-    ls += format("gChain = \"%s\";", gChain)
+        select {gCargoSet}
-    ls += format("gMinNo = %d;", gMinNo)
+        gBusy = false
-    ls += format("gMaxNo = %d;", gMaxNo)
+        background ECHO yellow
-    ls += format("gCargoSet = %s;", gCargoSet)
+        set bondPicking true
-     ls += format("gSCidx = %d;", gSCidx)
+        refresh
-    ls += format("gSCcircle = %d;", gSCcircle)
+     }
-    ls += format("gSCpt = %s;", gSCpt)
+}
-    ls += "collectRotors();"
-    ls += "tugDragDoneMB();"
+# Bound to ALT-SHIFT-LEFT-DRAG by tug_enable_drag
-     plicoRecord(ls)
+function tug_drag_2_mb() {
+     tug_drag_mb(true)
 }
-# Bound to LEFT-UP by tugEnableDrag
+# Bound to ALT-LEFT-DRAG by tug_enable_drag
-function tugDragDoneMB() {
+function tug_drag_mb(alt) {
      if (not gBusy) {
-         if (gPlicoRecord != "") {
+        gBusy = true
-            recordDrag()
+        var dx = (40.0 * (_mouseX - gMouseX))/_width
-        }
+        var dy = (40.0 * (_mouseY - gMouseY))/_height
+        var q = quaternion()
+        var ptd = {@dx @dy 0}
+        var pt = (!q)%ptd
+        var caxis = {0 0 0}
+         if (distance(pt,  {0 0 0}) > 0.004) {
+            # If sidechain mode
+            if (gSCidx >= 0) {
+                if ({atomIndex=gSCidx}.atomName == "O") {
+                    if ({atomIndex=gSCidx}.group != "PRO") {
+                        var dir = ((abs(dx) > abs(dy))
+                            ? ((dx < 0) ? 10 : -10)
+                            : ((dy < 0) ? 1 : -1))
+                        counter_rotate(gSCidx, dir, not alt)
+                    }
+                }
+                else {
+                    gSCcheck = not alt
+                    tug_sc(pt)
+                }
+            }
-        # Move by rotation on rotor sets, smallest first
+            # Else
-        gBusy = TRUE
+            else {
-        background ECHO pink
-        refresh
-        # If side chain mode
+                # If new drag
-        if (gSCidx >= 0) {
+                if (gNewDrag) {
-            dragSC()
+                    gNewDrag = false
-        }
+                    save state gState
+                }
-        # Else
+                # If destination atom defined
-        else if (not gTow) {
+                if (gDestAtomIdx >= 0) {
-            gOK = TRUE
+                    var v = {atomIndex=gDestAtomIdx}.xyz - {selected}.xyz
-            timeout ID"tug" 20.0 "timedOut(\"Tug timed out\")"
+                    if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
-            if ((gCrotors.size < gNrotors.size) or (gNanchorIdx < 0)) {
+                        pt = -v/20.0
-                if (gCrotors.size > 4) {
+                    }
-                     tugTrackC()  # PULLSTRING MODEL
+                    else {
+                        pt = v/20.0
+                     }
                  }
-                if (gOK and (gNrotors.size > 4)) {
-                    tugTrackN()  # PULLSTRING MODEL
-                }
-            }
-            else {
-                if (gNrotors.size > 4) {
-                    tugTrackN()  # PULLSTRING MODEL
-                }
-                if (gOK and (gCrotors.size > 4)) {
-                    tugTrackC()  # PULLSTRING MODEL
-                }
-            }
-            timeout ID"tug" OFF
-            # If anchor angles acute, fail
+                # Move the cargo
-            if (gOK == TRUE) {
+                select {gCargoSet}
-                 if (gCanchorIdx >= 0) {
-                    var ic = getCwardBBidx(gCanchorIdx, gChain)
+                # If pivots defined, rotate it
-                     var in = getNwardBBidx(gCanchorIdx, gChain)
+                 if (g1pivotIdx >= 0) {
-                     if ((ic >= 0) and
-                         angle({atomIndex=ic}, {atomIndex=gCanchorIdx}, {atomIndex=in})
+                     # If two pivots
-                        < 100.0) {
+                     if (g2pivotIdx >= 0) {
-                        gOK = FALSE
+                         caxis = {atomIndex=g2pivotIdx}
                      }
-                }
-                if (gNanchorIdx >= 0) {
+                     # Else
-                     var ic = getCwardBBidx(gNanchorIdx, gChain)
+                     else {
-                     var in = getNwardBBidx(gNanchorIdx, gChain)
+                        caxis = cross(pt, {0 0 0}) + {atomIndex=g1pivotIdx}.xyz
-                    if ((in >= 0) and
-                        angle({atomIndex=ic}, {atomIndex=gNanchorIdx}, {atomIndex=in})
-                        < 100.0) {
-                        gOK = FALSE
                      }
+                    var dir = ((abs(dx) > abs(dy))
+                        ? ((dx < 0) ? 2 : -2)
+                        : ((dy < 0) ? 2 : -2))
+                    rotate_selected_record(g1pivotIdx, caxis, dir)
                  }
-            }
-            # If too far
+                # Else translate it
-            if (not gOK) {
+                else {
-                timedOut("TUG TOO FAR!")
+                    translate_selected_record(pt)
-            }
+                }
-            # Else OK
+                # If collisions
-            else {
+                var cNotSels = (within(kCtolerance, false, {selected})
+                    and not {gMovingSet})
+                if ((cNotSels) and (not alt)) {
+                    gOk2 = true
+                    for (var i = 1; i <= cNotSels.size;  i++) {
-                select ((atomno >= gNanchorNo) and (atomno <= gCanchorNo)
+                        # If net collision vector same as move vector
-                    and (chain = gChain))
+                        var cSels = (within(kCtolerance, false, cNotSels[i]) and {selected})
-                var idx = {(atomno=@{{chain=gChain}.atomno.min})
+                        for (var j = 1; j <= cSels.size;  j++) {
-                    and (chain=gChain)}.atomIndex
+                            var v1 = cNotSels[i].xyz - cSels[j].xyz
+                            if (abs(angle(v1, {0 0 0}, pt)) < 90) {
+                                # If tow mode
+                                if (gTow) {
-                var ihc = 0
+                                    # Make a dynamic pivot
-                for (ihc = 0; ihc < 10; ihc++) {
+                                    if (g1pivotIdx < 0) {
-                    handleCollisions2( idx)
+                                        g1pivotIdx = cSels[j].atomIndex
-                    if (countCollisions(({})) == 0) {
+                                        g1dynamicIdx = cNotSels[i].atomIndex
-                        break
+                                        color {atomIndex=g1pivotIdx} lightgreen
-                    }
+                                        set_distance_idx(cNotSels[i].atomIndex,
-                }
+                                            cSels[j].atomIndex,
-                if (ihc == 10) {
+                                            kCtolerance + kDtolerance)
-                    var p = prompt("Unable to handle all collisions!")
+                                    }
-                    restore state gState
+                                    else if (g2pivotIdx < 0) {
-                }
+                                        g2pivotIdx = cSels[j].atomIndex
-            }
+                                        g2dynamicIdx = cNotSels[i].atomIndex
-        }
+                                        color {atomIndex=g2pivotIdx} lightgreen
-        select {gCargoSet}
+                                        set_distance_idx(cNotSels[i].atomIndex,
-        gBusy = FALSE
+                                            cSels[j].atomIndex,
-        background ECHO yellow
+                                            kCtolerance + kDtolerance)
-        refresh
+                                    }
-    }
+                                    else {
-}
+                                        gOk2 = false
+                                    }
+                                }
+                                else {
-# Bound to ALT-SHIFT-LEFT-DRAG by tugEnableDrag
+                                    # Try to resolve
-function tugDrag2MB() {
+                                    select @{cSels[j]}
-    tugDragMB(TRUE)
+                                    var idx = {(atomno=@{{(chain=gChain)
-}
+                                        and thisModel}.atomno.min})
+                                        and (chain=gChain) and thisModel}.atomIndex
+                                    handle_collisions( idx)
+                                }
+                            }
+                        } # endfor
+                        if (not gOk2) {
+                            break
+                        }
+                    } # endfor
-# Bound to ALT-LEFT-DRAG by tugEnableDrag
+                    # If unable
-function tugDragMB(alt) {
+                    if (not gOk2) {
-    if (not gBusy) {
-        gBusy = TRUE
-        var dx = (40.0 * (_mouseX - gMouseX))/_width
-        var dy = (40.0 * (_mouseY - gMouseY))/_height
-        var q = quaternion()
-        var ptd = {@dx @dy 0}
-        var pt = (!q)%ptd
-        var axis = {0 0 0}
-        if (distance(pt,  {0 0 0}) > 0.004) {
-            # If sidechain mode
-            if (gSCidx >= 0) {
-                if ({atomIndex=gSCidx}.atomName == "O") {
-                    dir = ((abs(dx) > abs(dy))
-                        ? ((dx < 0) ? 2 : -2)
-                        : ((dy < 0) ? 2 : -2))
-                    counterRotate(gSCidx, dir, not alt)
-                }
-                else {
-                    gSCcheck = not alt
-                    tugSideChain(pt)
-                }
-            }
-            # Else
+                        # Back off
-            else {
+                        background ECHO pink
+                        delay 1
-                # If new drag
+                        if (g1pivotIdx >= 0) {
-                if (gNewDrag) {
+                            rotate_selected_record(g1pivotIdx, caxis, -a)
-                    gNewDrag = FALSE
+                        }
-                    save state gState
+                        else {
-                }
+                            translate_selected_record(-pt)
+                         }
-                # If destination atom defined
+                        background ECHO yellow
-                if (gDestAtomIdx >= 0) {
+                         set bondPicking true
-                    var v = {atomIndex=gDestAtomIdx}.xyz - {selected}.xyz
-                    if (abs(angle({atomIndex=gDestAtomIdx}.xyz, {0 0 0}, pt)) < 90) {
-                         pt = -v/20.0
-                    }
-                    else {
-                         pt = v/20.0
                      }
                  }
+            }
-                 # Move the cargo
+            # If dynamic pivots
-                 select {gCargoSet}
+            if (g1dynamicIdx >= 0) {
+                 var v1 = {atomIndex=g1dynamicIdx}.xyz - {atomIndex=g1pivotIdx}.xyz
+                 if (abs(angle(v1, {0 0 0}, pt)) > 90) {
+                    color {atomIndex=g1pivotIdx} @gAltScheme
+                    g1pivotIdx = -1
+                    g1dynamicIdx = -1
-                 # If pivots defined, rotate it
+                 }
-                if (g1pivotIdx >= 0) {
+            }
+            if (g2dynamicIdx >= 0) {
+                var v1 = {atomIndex=g2dynamicIdx}.xyz - {atomIndex=g2pivotIdx}.xyz
+                if (abs(angle(v1, {0 0 0}, pt)) > 90) {
+                    color {atomIndex=g2pivotIdx} @gAltScheme
+                    g2pivotIdx = -1
+                    g2dynamicIdx = -1
+                }
+            }
-                    # If two pivots
+            gMouseX = _mouseX
-                    if (g2pivotIdx >= 0) {
+            gMouseY = _mouseY
-                        axis = {atomIndex=g2pivotIdx}
+        }
-                    }
+        select {gCargoSet}
+        gBusy = false
-                    # Else
+    }
-                    else {
+}
-                        axis = cross(pt, {0 0 0}) + {atomIndex=g1pivotIdx}.xyz
-                    }
-                    dir = ((abs(dx) > abs(dy))
+# Bound to ALT-LEFT-DOWN by tug_enable_drag
-                        ? ((dx < 0) ? 2 : -2)
+function tug_mark_mb() {
-                        : ((dy < 0) ? 2 : -2))
+    gMouseX = _mouseX
-                    rotateSelectedRecord(g1pivotIdx, axis, dir)
+    gMouseY = _mouseY
+    gNewDrag = true
+}
-                }
+# Called by tug_cargo_mb
+function tug_enable_drag() {
+    gEcho = "__________TUG__________|ALT-CLICK=mark block|SHIFT-CLICK=anchors" +
+        "|ALT-CTRL-CLICK=pivots|ALT-SHIFT-CLICK=dest atom|ALT-DRAG=move" +
+        "|ALT-SHIFT-DRAG=alt move|CLICK bond=freeze|ALT-DOUBLE-CLICK=undo" +
+        "|SHIFT-DOUBLE-CLICK=exit"
+    echo @gEcho
-                # Else translate it
+    # Allow atoms to be dragged
-                else {
+    bind "ALT-LEFT-DOWN" "tug_mark_mb";
-                    translateSelectedRecord(pt)
+    bind "ALT-LEFT-UP" "tug_drag_done_mb";
-                }
+    bind "ALT-SHIFT-LEFT-DOWN" "tug_mark_mb";
+    bind "ALT-LEFT-DRAG" "tug_drag_mb";
+    bind "ALT-SHIFT-LEFT-DRAG" "tug_drag_2_mb";
-                # If collisions
+    unbind "SHIFT-LEFT-CLICK"
-                var cNotSels = (within(kCtolerance, FALSE, {selected})
+    bind "SHIFT-LEFT-CLICK" "_pickAtom";
-                    and not {gMovingSet})
+    bind "SHIFT-LEFT-CLICK" "+:tug_anchor_mb";
-                if ((cNotSels.size > 0) and (not alt)) {
-                    gOk2 = TRUE
-                    for (var i = 1; i <= cNotSels.size;  i++) {
-                        # If net collision vector same as move vector
+    bind "ALT-CTRL-LEFT-CLICK" "_pickAtom";
-                        cSels = (within(kCtolerance, FALSE, cNotSels[i]) and {selected})
+    bind "ALT-CTRL-LEFT-CLICK" "+:tug_pivot_mb";
-                        for (var j = 1; j <= cSels.size;  j++) {
-                            var v1 = cNotSels[i].xyz - cSels[j].xyz
+    bind "ALT-SHIFT-LEFT-CLICK" "_pickAtom";
-                            if (abs(angle(v1, {0 0 0}, pt)) < 90) {
+    bind "ALT-SHIFT-LEFT-CLICK" "+:tug_dest_atom_mb";
+}
-                                # If tow mode
+# Bound to SHIFT-LEFT-CLICK by tug_cargo_mb
-                                if (gTow) {
+function tug_anchor_mb() {
+    if ({atomIndex=_atomPicked}.chain == gChain) {
+        var aPidx = get_sc_bb_idx( _atomPicked, gChain)
-                                    # Make a dynamic pivot
+        var pno = {atomIndex=aPidx}.atomno
-                                    if (g1pivotIdx < 0) {
+        if (pno > {atomIndex=gCcargoIdx}.atomno) {
-                                        g1pivotIdx = cSels[j].atomIndex
+            select {atomIndex=gCanchorIdx}
-                                        g1dynamicIdx = cNotSels[i].atomIndex
+            halo off
-                                        color {atomIndex=g1pivotIdx} lightgreen
+            if (gCanchorIdx == aPidx) {
-                                        setDistanceIdx(cNotSels[i].atomIndex,
+                gCanchorIdx = -1
-                                            cSels[j].atomIndex,
+                gCanchorNo = gMaxNo + 1
-                                            kCtolerance + kDtolerance)
+            }
-                                    }
+            else {
-                                    else if (g2pivotIdx < 0) {
+                gCanchorIdx = aPidx
-                                        g2pivotIdx = cSels[j].atomIndex
+                gCanchorNo = {atomIndex=gCanchorIdx}.atomno
-                                        g2dynamicIdx = cNotSels[i].atomIndex
+                select {atomIndex=gCanchorIdx}
-                                        color {atomIndex=g2pivotIdx} lightgreen
+                halo on
-                                        setDistanceIdx(cNotSels[i].atomIndex,
+            }
-                                            cSels[j].atomIndex,
+            collect_bb_rotors(false)
-                                            kCtolerance + kDtolerance)
+        }
-                                    }
+        else if (pno < {atomIndex=gNcargoIdx}.atomno) {
-                                    else {
+            select {atomIndex=gNanchorIdx}
-                                        gOk2 = FALSE
+            halo off
-                                    }
+            if (gNanchorIdx == aPidx) {
-                                }
+                gNanchorIdx = -1
-                                else {
+                gNanchorNo = gMinNo - 1
+            }
-                                    # Try to resolve
+            else {
-                                    select cSels[j]
+                gNanchorIdx = aPidx
-                                    var idx = {(atomno=@{{chain=gChain}.atomno.min})
+                gNanchorNo = {atomIndex=gNanchorIdx}.atomno
-                                        and (chain=gChain)}.atomIndex
+                select {atomIndex=gNanchorIdx}
-                                    handleCollisions2( idx)
+                halo on
-                                }
+            }
-                            }
+            collect_bb_rotors(true)
-                        } # endfor
+        }
-                        if (not gOk2) {
+        else {
-                            break
+            tow_cargo_mb()
-                        }
+        }
-                    } # endfor
+        # Get moving atoms set
+        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
+            and (chain=gChain) and thisModel)}
+    }
+    select {gCargoSet}
+}
-                    # If unable
+# Bound to ALT-SHIFT-LEFT-CLICK by tug_cargo_mb
-                    if (not gOk2) {
+function tug_dest_atom_mb() {
+    var aOk = true
+    if ({atomIndex=_atomPicked}.chain == gChain) {
-                        # Back off
+        var pno = {atomIndex=_atomPicked}.atomno
-                        background ECHO pink
+        if ((pno <= {atomIndex=gCcargoIdx}.atomno)
-                        delay 1
+             and (pno >= {atomIndex=gNcargoIdx}.atomno)) {
-                        if (g1pivotIdx >= 0) {
+            aOk = false
-                            rotateSelectedRecord(g1pivotIdx, axis, -a)
+        }
-                        }
+    }
-                        else {
+    if (aOk) {
-                            translateSelectedRecord(-pt)
+        select {atomIndex=gDestAtomIdx}
-                        }
+        star off
-                        background ECHO yellow
+        if (gDestAtomIdx == _atomPicked) {
-                    }
+            gDestAtomIdx = -1
-                }
+        }
-             }
+        else {
+             gDestAtomIdx = _atomPicked
-            # If dynamic pivotsTBD
+             select {atomIndex=gDestAtomIdx}
-            if (g1dynamicIdx >= 0) {
+             star on
-                var v1 = {atomIndex=g1dynamicIdx}.xyz - {atomIndex=g1pivotIdx}.xyz
-                if (abs(angle(v1, {0 0 0}, pt)) > 90) {
-                    color {atomIndex=g1pivotIdx} @gAltScheme
-                    g1pivotIdx = -1
-                    g1dynamicIdx = -1
-                }
-            }
-            if (g2dynamicIdx >= 0) {
-                var v1 = {atomIndex=g2dynamicIdx}.xyz - {atomIndex=g2pivotIdx}.xyz
-                if (abs(angle(v1, {0 0 0}, pt)) > 90) {
-                    color {atomIndex=g2pivotIdx} @gAltScheme
-                    g2pivotIdx = -1
-                    g2dynamicIdx = -1
-                }
-             }
-             gMouseX = _mouseX
-             gMouseY = _mouseY
          }
          select {gCargoSet}
-        gBusy = FALSE
      }
 }
-# Bound to ALT-LEFT-DOWN by tugEnableDrag
+# Bound to CTRL-LEFT-CLICK by tug_cargo_mb
-function tugMarkMB() {
+function tug_pivot_mb() {
-     gMouseX = _mouseX
+     if (g1pivotIdx == _atomPicked) {
-    gMouseY = _mouseY
+        color {atomIndex=g1pivotIdx} @gScheme
-    gNewDrag = TRUE
+        if (g2pivotIdx >= 0) {
-}
+            g1pivotIdx = g2pivotIdx
+            g2pivotIdx = -1
-# Called by tugCargoMB
+            g2dynamicIdx = -1
-function tugEnableDrag() {
+        }
-    gEcho = "__________TUG__________|ALT-CLICK=mark block|SHIFT-CLICK=anchors" +
+         else {
-         "|ALT-CTRL-CLICK=pivots|ALT-SHIFT-CLICK=dest atom|ALT-DRAG=move" +
+            g1pivotIdx = -1
-         "|SHIFT-ALT-DRAG=alt move|DOUBLE-CLICK=exit"
+            g1dynamicIdx = -1
-    echo @gEcho
+        }
+    }
+    else if (g2pivotIdx == _atomPicked) {
+        color {atomIndex=g2pivotIdx} @gScheme
+         g2pivotIdx = -1
+        g2dynamicIdx = -1
+    }
+    else if (g1pivotIdx >= 0) {
+        if (g2pivotIdx >= 0) {
+            color {atomIndex=g2pivotIdx} @gScheme
+        }
-    # Allow atoms to be dragged
+        g2pivotIdx = _atomPicked
-    bind "ALT-LEFT-DOWN" "tugMarkMB";
+        g2dynamicIdx = -1
-    bind "ALT-LEFT-UP" "tugDragDoneMB";
+        color {atomIndex=g2pivotIdx} green
-     bind "ALT-SHIFT-LEFT-DOWN" "tugMarkMB";
+     }
-     bind "ALT-SHIFT-LEFT-UP" "tugDragDoneMB";
+     else {
-    bind "ALT-LEFT-DRAG" "tugDragMB";
+        g1pivotIdx = _atomPicked
-    bind "ALT-SHIFT-LEFT-DRAG" "tugDrag2MB";
+        g1dynamicIdx = -1
+        color {atomIndex=g1pivotIdx} green
-     unbind "SHIFT-LEFT-CLICK"
+     }
-     bind "SHIFT-LEFT-CLICK" "_pickAtom";
+     select {gCargoSet}
-    bind "SHIFT-LEFT-CLICK" "+:tugAnchorMB";
+}
-    bind "ALT-CTRL-LEFT-CLICK" "_pickAtom";
+# Bound to SHIFT-LEFT-CLICK by plico_tug
-     bind "ALT-CTRL-LEFT-CLICK" "+:tugPivotMB";
+function tow_cargo_mb() {
+     gTow = true
+    gChain = {atomIndex=_atomPicked}.chain
+    gMinNo = {(chain=gChain) and thisModel}.atomno.min
+    gMaxNo = {(chain=gChain) and thisModel}.atomno.max
+    gCcargoIdx = -1
+    gNcargoIdx = -1
+    gCanchorIdx = -1
+    gCanchorNo = gMaxNo + 1
+    gNanchorIdx = -1
+    gNanchorNo = gMinNo - 1
-     bind "ALT-SHIFT-LEFT-CLICK" "_pickAtom";
+     # Highlight cargo cluster
-     bind "ALT-SHIFT-LEFT-CLICK" "+:tugDestAtomMB";
+     select {(chain=gChain) and thisModel}
-}
+     gCargoSet = {selected}
+    gMovingSet = {selected}
-# Bound to SHIFT-LEFT-CLICK by tugCargoMB
+    set_colors()
-function tugAnchorMB() {
-     if ({atomIndex=_atomPicked}.chain == gChain) {
-        var aPidx = getScBBidx( _atomPicked, gChain)
-        var pno = {atomIndex=aPidx}.atomno
+    # Enable dragging
-        if (pno > {atomIndex=gCcargoIdx}.atomno) {
+    tug_enable_drag()
-            select {atomIndex=gCanchorIdx}
+    select {gCargoSet}
-            halo off
+    halo off
-            if (gCanchorIdx == aPidx) {
+    var es = gEcho.replace("anchors","mark chain")
-                gCanchorIdx = -1
+    echo @es
-                gCanchorNo = gMaxNo + 1
+    unbind "SHIFT-LEFT-CLICK"
-            }
+    bind "SHIFT-LEFT-CLICK" "_pickAtom";
-            else {
+    bind "SHIFT-LEFT-CLICK" "+:tow_cargo_mb";
-                gCanchorIdx = aPidx
+}
-                gCanchorNo = {atomIndex=gCanchorIdx}.atomno
-                select {atomIndex=gCanchorIdx}
+# Bound to ALT-LEFT-CLICK by plico_tug or called by plicotoab.toabCargoMB
-                halo on
+function tug_cargo_mb() {
-            }
-             collectBBrotors(FALSE)
+    # If O or movable side chain atom picked
+    if ((({atomIndex=_atomPicked}.atomName = "O")
+        and ({atomIndex=_atomPicked}.group != "PRO"))
+        or (is_moveable_sc( _atomPicked))) {
+        if (gSCidx >= 0) {
+             draw gSCcircle DELETE
          }
-         else if (pno < {atomIndex=gNcargoIdx}.atomno) {
+         if (gSCidx == _atomPicked) {
-             select {atomIndex=gNanchorIdx}
+             gSCidx = -1
-            halo off
-            if (gNanchorIdx == aPidx) {
-                gNanchorIdx = -1
-                gNanchorNo = gMinNo - 1
-            }
-            else {
-                gNanchorIdx = aPidx
-                gNanchorNo = {atomIndex=gNanchorIdx}.atomno
-                select {atomIndex=gNanchorIdx}
-                halo on
-            }
-            collectBBrotors(TRUE)
          }
          else {
-             towCargoMB()
+             gSCidx = _atomPicked
+            gSCpt = {atomIndex=gSCidx}.xyz
+            draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
          }
-        # Get moving atoms set
-        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
-            and (chain=gChain))}
      }
-     select {gCargoSet}
+     else {
-}
+        if ({atomIndex=_atomPicked}.chain != gChain) {
+            if (gTow) {
-# Bound to ALT-SHIFT-LEFT-CLICK by tugCargoMB
+                select {(chain=gChain) and thisModel}
-function tugDestAtomMB() {
+                color {selected} @gScheme
-    var aOk = TRUE
+            }
-    if ({atomIndex=_atomPicked}.chain == gChain) {
+            gChain = {atomIndex=_atomPicked}.chain
+            select ({atomIndex=gCcargoIdx} or {atomIndex=gNcargoIdx}
-        var pno = {atomIndex=_atomPicked}.atomno
+                or {atomIndex=gCanchorIdx} or {atomIndex=gNanchorIdx})
-        if ((pno <= {atomIndex=gCcargoIdx}.atomno) and (pno >= {atomIndex=gNcargoIdx}.atomno)) {
+            halo off
-             aOk = FALSE
+            gCcargoIdx = -1
+            gNcargoIdx = -1
+            gCanchorIdx = -1
+            gNanchorIdx = -1
+        }
+        gTow = false
+        gMinNo = {(chain=gChain) and thisModel}.atomno.min
+        gMaxNo = {(chain=gChain) and thisModel}.atomno.max
+        if (gNanchorIdx < 0) {
+             gNanchorNo = gMinNo - 1
          }
-    }
+         if (gCanchorIdx < 0) {
-    if (aOk) {
+             gCanchorNo = gMaxNo + 1
-        select {atomIndex=gDestAtomIdx}
-        star off
-         if (gDestAtomIdx == _atomPicked) {
-             gDestAtomIdx = -1
          }
-         else {
+         var aPidx = get_sc_bb_idx( _atomPicked, gChain)
-            gDestAtomIdx = _atomPicked
-            select {atomIndex=gDestAtomIdx}
+        gSCidx = -1
-            star on
+        draw gSCcircle DELETE
-         }
-         select {gCargoSet}
+         # If existing cWard cargo picked
-    }
+         if (gCcargoIdx == aPidx) {
-}
+            # Clear the highlight
+            select {atomIndex=gCcargoIdx}
+            halo off
-# Bound to CTRL-LEFT-CLICK by tugCargoMB
+            # If nWard cargo exists, mark it as the cWard cargo
-function tugPivotMB() {
+            if (gNcargoIdx != gCcargoIdx) {
-    if (g1pivotIdx == _atomPicked) {
+                gCcargoIdx = get_cp_idx(gNcargoIdx)
-        color {atomIndex=g1pivotIdx} @gScheme
+                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
-        if (g2pivotIdx >= 0) {
+             }
-            g1pivotIdx = g2pivotIdx
+            else {
-            g2pivotIdx = -1
+                gCcargoIdx = -1
-             g2dynamicIdx = -1
+                gNcargoIdx = -1
-        }
+            }
-        else {
-            g1pivotIdx = -1
-            g1dynamicIdx = -1
          }
-    }
+        else if (gNcargoIdx == aPidx) {
-    else if (g2pivotIdx == _atomPicked) {
+            select {atomIndex=gNcargoIdx}
-        color {atomIndex=g2pivotIdx} @gScheme
+            halo off
-        g2pivotIdx = -1
+            gNcargoIdx = get_nm_idx(gCcargoIdx)
-        g2dynamicIdx = -1
+            gNcargoNo = {atomIndex=gNcargoIdx}.atomno
-    }
-    else if (g1pivotIdx >= 0) {
-        if (g2pivotIdx >= 0) {
-            color {atomIndex=g2pivotIdx} @gScheme
          }
+        else if (gCcargoIdx >= 0) {
+            var no = {atomIndex=aPidx}.atomno
-        g2pivotIdx = _atomPicked
+            # If pick is nWard of it
-        g2dynamicIdx = -1
+            if (no < {atomIndex=gCcargoIdx}.atomno) {
-        color {atomIndex=g2pivotIdx} green
-    }
-    else {
-        g1pivotIdx = _atomPicked
-        g1dynamicIdx = -1
-        color {atomIndex=g1pivotIdx} green
-    }
-    select {gCargoSet}
-}
-# Bound to SHIFT-LEFT-CLICK by plicoTug
+                # If exists, clear its highlight
-function towCargoMB() {
+                if (gNcargoIdx != gCcargoIdx) {
-    gTow = TRUE
+                    select {atomIndex=gNcargoIdx}
-    gChain = {atomIndex=_atomPicked}.chain
+                    halo off
-    gMinNo = {chain=gChain}.atomno.min
+                }
-    gMaxNo = {chain=gChain}.atomno.max
-    gCcargoIdx = -1
-    gNcargoIdx = -1
-    gCanchorIdx = -1
-    gCanchorNo = gMaxNo + 1
-    gNanchorIdx = -1
-    gNanchorNo = gMinNo - 1
-    # Highlight cargo cluster
+                # Set new nWard cargo and highlight it
-    select {chain=gChain}
+                gNcargoIdx = get_nm_idx(aPidx)
-    gCargoSet = {selected}
+                gNcargoNo = {atomIndex=gNcargoIdx}.atomno
-    gMovingSet = {selected}
+            }
-    setColors()
-    # Enable dragging
+            # Else cWard
-    tugEnableDrag()
+            else {
-    select {gCargoSet}
-    halo off
-    var es = gEcho.replace("anchors","mark chain")
-    echo @es
-    unbind "SHIFT-LEFT-CLICK"
-    bind "SHIFT-LEFT-CLICK" "_pickAtom";
-    bind "SHIFT-LEFT-CLICK" "+:towCargoMB";
-}
-# Bound to ALT-LEFT-CLICK by plicoTug
+                # Clear its old highlight
-function tugCargoMB() {
+                select {atomIndex=gCcargoIdx}
+                if (gNcargoIdx != gCcargoIdx) {
+                    halo off
+                }
-    # If O or movable side chain atom picked
+                # Set new cWard cargo and highlight
-    if (({atomIndex=_atomPicked}.atomName = "O")
+                gCcargoIdx = get_cp_idx(aPidx)
-        or (isMovableSideChain( _atomPicked))) {
+                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
-        if (gSCidx >= 0) {
+             }
-             draw gSCcircle DELETE
-        }
-        if (gSCidx == _atomPicked) {
-            gSCidx = -1
          }
+        # Else no cWard cargo
          else {
-             gSCidx = _atomPicked
-             gSCpt = {atomIndex=gSCidx}.xyz
+            # Set new cWard cargo and highlight
-             draw gSCcircle CIRCLE {atomIndex=gSCidx} MESH NOFILL
+             gCcargoIdx = get_cp_idx(aPidx)
+             gCcargoNo = {atomIndex=gCcargoIdx}.atomno
+            gNcargoIdx = get_nm_idx(gCcargoIdx)
+             gNcargoNo = {atomIndex=gNcargoIdx}.atomno
          }
-    }
-    else {
+        # If any anchor now inside cargo cluster, kill it
-         if ({atomIndex=_atomPicked}.chain != gChain) {
+         if ({atomIndex=gCanchorIdx}.atomno <= {atomIndex=gCcargoIdx}.atomno) {
-            if (gTow) {
-                select {chain=gChain}
-                color {selected} @gScheme
-            }
-            gChain = {atomIndex=_atomPicked}.chain
-            select ({atomIndex=gCcargoIdx} or {atomIndex=gNcargoIdx}
-                or {atomIndex=gCanchorIdx} or {atomIndex=gNanchorIdx})
-            halo off
-            gCcargoIdx = -1
-            gNcargoIdx = -1
              gCanchorIdx = -1
+            gCanchorNo = gMaxNo + 1
+        }
+        if ({atomIndex=gNanchorIdx}.atomno >= {atomIndex=gNcargoIdx}.atomno) {
              gNanchorIdx = -1
-        }
-        gTow = FALSE
-        gMinNo = {chain=gChain}.atomno.min
-        gMaxNo = {chain=gChain}.atomno.max
-        if (gNanchorIdx < 0) {
              gNanchorNo = gMinNo - 1
          }
-        if (gCanchorIdx < 0) {
-            gCanchorNo = gMaxNo + 1
-        }
-        var aPidx = getScBBidx( _atomPicked, gChain)
-         gSCidx = -1
+         # Highlight cargo cluster
-         draw gSCcircle DELETE
+        select_nward_idx(gCcargoIdx, gNcargoIdx)
+        gCargoSet = {selected}
+         set_colors()
-         # If existing cWard cargo picked
+         # Collect the rotor sets
-         if (gCcargoIdx == aPidx) {
+         collect_rotors()
-            # Clear the highlight
+        # Get moving atoms set
-             select {atomIndex=gCcargoIdx}
+        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
-            halo off
+             and (chain=gChain) and thisModel)}
+    }
-            # If nWard cargo exists, mark it as the cWard cargo
+    # Enable dragging
-            if (gNcargoIdx != gCcargoIdx) {
+    if (gToab) {
-                gCcargoIdx = getCpIdx(gNcargoIdx)
+        to_ab_enable_drag()
-                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
+    }
-            }
+    else {
-            else {
+         tug_enable_drag()
-                gCcargoIdx = -1
+    }
-                gNcargoIdx = -1
-            }
-        }
-         else if (gNcargoIdx == aPidx) {
-            select {atomIndex=gNcargoIdx}
-            halo off
-            gNcargoIdx = getNmIdx(gCcargoIdx)
-            gNcargoNo = {atomIndex=gNcargoIdx}.atomno
-        }
-        else if (gCcargoIdx >= 0) {
-            var no = {atomIndex=aPidx}.atomno
+    select {gCargoSet}
+}
-            # If pick is nWard of it
+function tug_undo_mb() {
-            if (no < {atomIndex=gCcargoIdx}.atomno) {
+    if (prompt("Undo", "Yes|No", true) == "Yes") {
+        restore state gState
+    }
+}
-                # If exists, clear its highlight
+# Top level of Tug
-                if (gNcargoIdx != gCcargoIdx) {
+function plico_tug() {
-                    select {atomIndex=gNcargoIdx}
-                    halo off
-                }
-                # Set new nWard cargo and highlight it
+    # Load common functions if not already
-                gNcargoIdx = getNmIdx(aPidx)
+    if (kCommon < 7) {
-                gNcargoNo = {atomIndex=gNcargoIdx}.atomno
+        script $SCRIPT_PATH$plicoCommon.spt
-            }
+        if (kCommon < 7) {
+            prompt ("A newer version of plicoCommon.SPT is required")
-            # Else cWard
+             quit
-            else {
-                # Clear its old highlight
-                select {atomIndex=gCcargoIdx}
-                if (gNcargoIdx != gCcargoIdx) {
-                    halo off
-                }
-                # Set new cWard cargo and highlight
-                gCcargoIdx = getCpIdx(aPidx)
-                gCcargoNo = {atomIndex=gCcargoIdx}.atomno
-             }
          }
+    }
-        # Else no cWard cargo
+    gPlico = "TUG"
-        else {
+    plico_prelim(true, true)
+    gBondPicking = bondPicking
+    set bondPicking true
+    set PickCallback "jmolscript:tug_pick_cb"
-            # Set new cWard cargo and highlight
+    gEcho = ("_________TUG_________|ALT-CLICK=mark block|SHIFT-CLICK=mark chain" +
-            gCcargoIdx = getCpIdx(aPidx)
+        "|CLICK bond=freeze|ALT-DOUBLE-CLICK=undo|SHIFT-DOUBLE-CLICK=exit")
-            gCcargoNo = {atomIndex=gCcargoIdx}.atomno
+    echo @gEcho
-            gNcargoIdx = getNmIdx(gCcargoIdx)
+    gCrotors = array()
-            gNcargoNo = {atomIndex=gNcargoIdx}.atomno
+    gNrotors = array()
+    clear_atom_idxs()
+    gToab = false
-            # Set default cWard anchor at cWard N
+    bind "ALT-LEFT-CLICK" "_pickAtom";
-            var iNo = gMaxNo
+    bind "ALT-LEFT-CLICK" "+:tug_cargo_mb";
-            for (; iNo > 0; iNo--) {
+    bind "SHIFT-LEFT-CLICK" "_pickAtom";
-                if ({(atomno=iNo) and (chain=gChain)}.atomName == "N") {
+    bind "SHIFT-LEFT-CLICK" "+:tow_cargo_mb";
-                    break;
+    bind "ALT-LEFT-DOUBLE" "tug_undo_mb";
-                }
+    bind "SHIFT-DOUBLE" "tug_exit(true)";
-            }
+    bind "LEFT-CLICK" "+:plico_menu_toggle";
-            gCanchorIdx = {(atomno=iNo) and (chain=gChain)}.atomIndex
+}
-            gCanchorNo = {atomIndex=gCanchorIdx}.atomno
-        }
-        # If any anchor now inside cargo cluster, kill it
+# Bound to DOUBLE by plico_tug
-        if ({atomIndex=gCanchorIdx}.atomno <= {atomIndex=gCcargoIdx}.atomno) {
+function tug_exit() {
-            gCanchorIdx = -1
+    if (plico_exit()) {
-            gCanchorNo = gMaxNo + 1
+        set bondPicking gBondPicking
-         }
+        set PickCallback NONE
-         if ({atomIndex=gNanchorIdx}.atomno >= {atomIndex=gNcargoIdx}.atomno) {
+        select all
-            gNanchorIdx = -1
+        color bonds none
-            gNanchorNo = gMinNo - 1
-         }
+        reset kTug
+        reset gCanchorIdx
+        reset gCanchorNo
+         reset gPlico
+         reset gNanchorIdx
+        reset gNanchorNo
+        reset gCcargoIdx
+        reset gNcargoIdx
+        reset gCcargoNo
+        reset gNcargoNo
+        reset gDestAtomIdx
+        reset g1pivotIdx
+        reset g2pivotIdx
+        reset gSelSaves
+        reset gCrotors
+        reset gNrotors
+        reset gOkCollide
+        reset gChain
+        reset gMinNo
+        reset gMaxNo
+        reset gCargoSet
+        reset gMovingSet
+        reset gSCidx
+        reset gSCcircle
+        reset gSCpt
+        reset gTargetPt
+        reset gNewDrag
+        reset gTow
+        reset g1dynamicIdx
+        reset g2dynamicIdx
+        reset gSCcheck
+        reset gBondPicking
+        reset gFreeze
+        reset gToab
+        reset function "get_cp_idx"
+        reset function "get_cm_no"
+        reset function "get_nm_idx"
+        reset function "get_np_no"
+        reset function "get_cb_idx"
+        reset function "get_o_idx"
+        reset function "get_nward_bb_idx"
+        reset function "get_cward_bb_idx"
+        reset function "get_sc_set"
+        reset function "get_sc_bb_idx"
+        reset function "is_bb_idx"
+        reset function "is_sc_idx"
+        reset function "select_add_sc"
+        reset function "handle_collisions"
+        reset function "tug_track_idx"
+        reset function "do_counter_rotate"
+        reset function "counter_rotate"
+        reset function "counter_rotate_2"
+        reset function "repair_proline"
+        reset function "repair_sc"
+        reset function "tug_track_c"
+        reset function "tug_track_n"
+        reset function "translate_selected_record"
+        reset function "rotate_selected_record"
+        reset function "collect_sc_rotors"
+        reset function "drag_sc"
+        reset function "fix_sc_collision_2"
+        reset function "is_moveable_sc"
+        reset function "is_rotor_avail"
+        reset function "xcollect_bb_rotors"
+        reset function "collect_bb_rotors"
+        reset function "collect_rotors"
+        reset function "tug_sc"
+        reset function "set_colors"
+        reset function "clear_atom_idxs"
+        reset function "timed_out"
+        reset function "record_drag"
+        reset function "tug_pick_cb"
+        reset function "tug_drag_done_mb"
+        reset function "tug_drag_2_mb"
+        reset function "tug_drag_mb"
+        reset function "tug_mark_mb"
+        reset function "tug_anchor_mb"
+        reset function "tug_enable_drag"
+        reset function "tug_dest_atom_mb"
+        reset function "tug_pivot_mb"
+        reset function "tow_cargo_mb"
+        reset function "tug_cargo_mb"
+        reset function "tug_undo_mb"
+         reset function "plico_tug"
-        # Highlight cargo cluster
-        selectNwardIdx(gCcargoIdx, gNcargoIdx)
-        gCargoSet = {selected}
-        setColors()
-        # Collect the rotor sets
-        collectRotors()
-        # Get moving atoms set
-        gMovingSet = {((atomno < gCanchorNo) and (atomno > gNanchorNo)
-            and (chain=gChain))}
      }
-    # Enable dragging
-    tugEnableDrag()
-    select {gCargoSet}
-}
-# Top level of Tug
-function plicoTug() {
-    # Push selected
-    gSelSaves = {selected}
-    select all
-    # Bad idea to proceed when collisions present
-    while (TRUE) {
-        var cc = countCollisions(({}))
-        if (cc > 0) {
-            var p = prompt(format("%d collision%s present!\nProceed anyway?",
-                cc, ((cc > 1) ? "s" : "")), "OK|Cancel|Repair", TRUE)
-            if (p == "Cancel") {
-                quit
-            }
-            else if (p == "Repair") {
-                select all
-                allSet = {selected}
-                gChain = "XX"
-                for (var idx = {allSet}.atomIndex.min;
-                    idx <= {allSet}.atomIndex.max; idx++) {
-                    if ({atomIndex=idx}.chain != gChain) {
-                        gChain = {atomIndex=idx}.chain
-                        select {chain=gChain}
-                        handleCollisions2( idx)
-                    }
-                }
-            }
-            else {
-                break
-            }
-        }
-        else {
-            break
-        }
-    } # endwhile
-    gZoom = script("show zoom")
-    gRotate = script("show rotation")
-    write tugsave.pdb
-    select none
-    gScheme = defaultColorScheme
-    gAltScheme = ((gScheme == "Jmol") ? "Rasmol" : "Jmol")
-    set echo TOP LEFT
-    background ECHO yellow
-    gEcho = ("_________TUG_________|ALT-CLICK=mark block|SHIFT-CLICK=mark chain" +
-        "|DOUBLE-CLICK=exit")
-    echo @gEcho
-    gCrotors = array()
-    gNrotors = array()
-    clearAtomIdxs()
-    gChain = ""
-    unbind
-    bind "ALT-LEFT-CLICK" "_pickAtom";
-    bind "ALT-LEFT-CLICK" "+:tugCargoMB";
-    bind "SHIFT-LEFT-CLICK" "_pickAtom";
-    bind "SHIFT-LEFT-CLICK" "+:towCargoMB";
-    bind "DOUBLE" "tugExit";
 }
-# Bound to DOUBLE by plicoTug
+# End of TUG.SPT
-function tugExit() {
+</pre>
-    var p = prompt("Exit tug?", "Yes|No|Undo", TRUE)
-    if (p == "Undo") {
-        load tugsave.pdb
-        script inline gZoom
-        rotate @gRotate
-        echo Tug session undone
-        if (gPlicoRecord != "") {
-            plicoRecord("load tugsave.pdb;")
-        }
-    }
-    if (p != "No") {
-        unbind
-        halo off
-        set allowMoveAtoms FALSE
-        echo
-        select all
-        halo off
-        star off
-        color {selected} @gScheme
-        draw gSCcircle DELETE
-        gBusy = FALSE
-        background ECHO yellow
-        # Pop selected
-        select gSelSaves
-    }
-}
-# End of TUG.SPT</pre>