XmlmmCIF equivalent: struct_biol_gen Data items in the STRUCT_BIOL_GEN category record details about the generation of each biological unit. The STRUCT_BIOL_GEN data items provide the specifications of the components that constitute that biological unit, which may include symmetry elements. XmlmmCIF equivalent: struct_biol_gen/details A description of special aspects of the symmetry generation of this portion of the biological structure. XmlmmCIF equivalent: struct_biol_gen/pdbx_full_symmetry_operation This item expresses category _struct_biol_gen.symmetry on an X, Y and Z basis. XmlmmCIF equivalent: struct_biol_gen/biol_id This data item is a pointer to _struct_biol.id in the STRUCT_BIOL category. XmlmmCIF equivalent: struct_biol_gen/asym_id This data item is a pointer to _struct_asym.id in the STRUCT_ASYM category. XmlmmCIF equivalent: struct_biol_gen/symmetry Describes the symmetry operation that should be applied to the atom set specified by _struct_biol_gen.asym_id to generate a portion of the biological structure.