XmlmmCIF equivalent: atom_sites_alt_gen Data items in the ATOM_SITES_ALT_GEN category record details about the interpretation of multiple conformations in the structure. XmlmmCIF equivalent: atom_sites_alt_gen/ens_id This data item is a pointer to _atom_sites_alt_ens.id in the ATOM_SITES_ALT_ENS category. XmlmmCIF equivalent: atom_sites_alt_gen/alt_id This data item is a pointer to _atom_sites_alt.id in the ATOM_SITES_ALT category.