6G3Q Crystal structure of human carbonic anhydrase II in complex with the inhibitor famotidine Homo sapiens (Human) 6G3V Crystal structure of human carbonic anhydrase I in complex with the inhibitor famotidine Homo sapiens (Human) 7UL3 CryoEM Structure of Inactive H2R Bound to Famotidine, Nb6M, and NabFab Homo sapiens (human), synthetic construct