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Kir.4.1(Kcnj10)is an inwardly-rectifying K channel expressed in the basolateral membrane of distal convoluted tubule(DCT).Loss-of-function mutations of Kir4.1 cause EAST or SeSAME syndrome and the renal phenotype of the disease includes salt wasting,hypomagnesemia,metabolic alkalosis and hypokalemia.