read coor pdb UUR17A_R3_em_bcr3.pdb all rmsd coor heavy 6A-56A,60A-70A,74A-108A,110A-114A ave resOrd_rmsd_heavy rmsd coor backbone 6A-56A,60A-70A,74A-108A,110A-114A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit