Sodium–hydrogen antiporter 3
(重定向自NHE3)

Sodium–hydrogen antiporter 3 also known as sodium–hydrogen exchanger 3 (NHE3) or solute carrier family 9 member 3 (SLC9A3) is a protein that in humans is encoded by the SLC9A3 gene.
SLC9A3 is a sodium–hydrogen antiporter. It is found in the tubulus proximal of the nephron of the kidney and in the apical membrane of enterocytes of the intestine. It is primarily responsible for maintaining the balance of sodium.