CA.1ae.4A gene on chromosome 17q23 that encodes a carbonic anhydrase, a zinc metalloenzyme that catalyses the reversible hydration of carbon dioxide. Carbonic anhydrases participate in various biological processes, including respiration, calcification, maintaining acid-base balance and bone resorption, as well as producing aqueous humour, cerebrospinal fluid, saliva and gastric acid. Carbonic anhydrase 4 is a glycosylphosphatidyl-inositol-anchored membrane isozyme, expressed on the luminal surfaces of pulmonary (and other) capillaries and proximal renal tubules; it is thought to have a role in hereditary defects in bicarbonate transport.
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