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A, modulation of ISO at −20 mV in response to 5-HT at pHo 6.3 and at pHo 7.3. ISO was measured every 30 s. B, mean inhibition of ISO by 5-HT at the pH indicated. The number of cells (n) is given above the bars. **P < 0.01 versus control (pHo 7.3) (paired t test).
