read coor pdb MRR110B_R3_em_bcr3.pdb all rmsd coor heavy 1A-35A,37A-78A,83A-93A ave resOrd_rmsd_heavy rmsd coor backbone 1A-35A,37A-78A,83A-93A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit