../ pdb_000021xk_xyz-ext-atom_v1-0.xml.gz 13-Feb-2026 17:37 9793 pdb_000021xk_xyz-no-atom_v1-0.xml.gz 13-Feb-2026 17:37 13K pdb_000021xk_xyz_v1-0.cif.gz 13-Feb-2026 17:37 21K pdb_000021xk_xyz_v1-0.xml.gz 13-Feb-2026 17:37 27K