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A and B, representative experiments showing changes in pHi in response to 1 min pulses of NH4Cl (25 mm) and the effects of Na+-free solution (A) and 1 mm amiloride (Amil; B) on pHi recovery. C, effect of Na+-free solution and amiloride on mean initial rates of pHi recovery. * Significantly different from paired control (Cont) recovery rate (Student's paired t test, P < 0.05). Error bars depict s.e.m.
