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system("dsspcmbi $pdbstructure $dsspfile") and die "System called fail
+ed.";

$residuecombofile = "$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