_pdbx_entity_instance_feature.ordinal 1 _pdbx_entity_instance_feature.comp_id Q20 _pdbx_entity_instance_feature.auth_asym_id A _pdbx_entity_instance_feature.feature_type 'SUBJECT OF INVESTIGATION' _pdbx_entity_instance_feature.auth_seq_num 47 _pdbx_entity_instance_feature.auth_comp_id R77