CA7, also known as Carbonic Anhydrase 7, consists of a 29 kDa and a shorter 23 kDa isoform, is involved in zinc ion binding as a member of the zinc metalloenzyme family that transports HCO3- and a proton (H+) into H20 and CO2. This process occurs in several pathways such as the metabolism and reversible hydration of carbon dioxide pathways. Disease research is currently being studied with relation to CA7 and colorectal cancer, glaucoma, insulin resistance and neuronitis.