read coor pdb UUR17A_NMR_em_bcr3.pdb all rmsd coor heavy 6A-55A,60A-70A,74A-108A,110A-114A ave resOrd_rmsd_heavy rmsd coor backbone 6A-55A,60A-70A,74A-108A,110A-114A ave resOrd_rmsd_bb write best.pdb coor all all pdb quit