The carbonic anhydrase 9 (CA9) protein plays a crucial role as a catalyst in the conversion of carbon dioxide and water. It promotes the formation of bicarbonate and hydrogen ions (dissociated ions of carbonic acid). Carbonic Anhydrase 9 Protein, Canine (HEK293, His) is the recombinant canine-derived Carbonic Anhydrase 9 protein, expressed by HEK293 , with C-His labeled tag.