Hi all, I issue the following command to pdb_atom_selection but I get 0 atoms selected at the end? $ phenix.pdb_atom_selection refine_to_submit.pdb "chain X and chain B" refine_to_submit.pdb Monomer Library directory: "/usr/local/phenix-1.8-1069/chem_data/mon_lib" Total number of atoms: 3817 Number of models: 1 Model: "" Number of chains: 6 Chain: "B" Number of atoms: 1800 Number of conformers: 1 Conformer: "" Number of residues, atoms: 84, 1800 Classifications: {'RNA': 84} Modifications used: {'rna3p_pyr': 26, 'rna2p_pur': 5, 'rna3p_pur': 44, 'rna2p_pyr': 9} Link IDs: {'rna3p': 70, 'rna2p': 13} Chain: "X" Number of atoms: 1800 Number of conformers: 1 Conformer: "" Number of residues, atoms: 84, 1800 Classifications: {'RNA': 84} Modifications used: {'rna3p_pyr': 26, 'rna2p_pur': 5, 'rna3p_pur': 44, 'rna2p_pyr': 9} Link IDs: {'rna3p': 70, 'rna2p': 13} chain X and chain B 0 atoms selected Thanks! F --------------------------------------------- Francis E. Reyes PhD 215 UCB University of Colorado at Boulder