Probable apical anion exchanger of the alpha-intercalated cells of kidney. May participate in HCO3(-) absorption. In contrast to the rabbit ortholog, it is present on basolateral membrane of cortical collecting duct kidney cells. Expressed in kidney and gastrointestinal tract. In kidney, it is highly expressed in the cortex, expressed at intermediate level in the outer medulla and not expressed in the inner medulla. It is expressed in the cecum, while it is absent in other segments of gastrointestinal tract. Belongs to the anion exchanger (TC 2.A.31) family.