CA1 (Carbonic anhydrase I) is a cytosolic protein which is found at the highest level in erythrocytes. Carbonic anhydrases (CAs) are a large family of zinc metalloenzymes that catalyze the reversible hydration of carbon dio, Xenopus/Amphibian,ide. They participate in a variety of biological processes, including respiration, calcification, acid-base balance, bone resorption and the formation of aqueous humor, cerebrospinal fluid, saliva and gastric acid. They show e, Xenopus/Amphibian,tensive diversity in tissue distribution and in their subcellular localization.