##
$residuecombofile = "$combodir$residue1$residue2$residue3$out";
##
##
if(open(PDB,"$pdbstructure"))
##
##
if ( -e $pdbstructure )
##
##
if ( -r $pdbstructure )
##
##
if($flag == 0)
##
##
No structure file. Moving to next structure in list