XmlmmCIF equivalent: entity_name_sys Data items in the ENTITY_NAME_SYS category record the systematic name or names associated with the entity, and tell which system was is the source of the systematic name. In some cases, the entity name may not be the same as the name of the biological structure. For instance, hemoglobin alpha chain would be the entity common name, not hemoglobin. XmlmmCIF equivalent: entity_name_sys/system The system used to generate the systematic name of the entity. XmlmmCIF equivalent: entity_name_sys/entity_id This data item is a pointer to _entity.id in the ENTITY category. XmlmmCIF equivalent: entity_name_sys/name The systematic name for the entity.