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Effect of 10–8 M aldosterone and media pH on Na/H antiporter activity. Cells were incubated in the presence or absence of 10–8 M aldosterone for 48 h, and at pH 7.4 or 6.8 for the last 24 h. Na/H antiporter activity was then measured at pH 7.4 and is reported as dpHi/dt. *P < 0.03, 6.8 vs. 7.4; **P < 0.02, 6.8 vs. 7.4. n = 8.
