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Figure 2 (A) Representative single-cell pHi recordings during acid pulses and (B) individual and mean JH6.9 values in ventricular myocytes obtained from unused donor hearts (open symbols) and recipient hearts with end-stage heart failure (solid symbols). In (B), n indicates the number of hearts in each group. pHi = intracellular pH; JH6.9 = rate of H+ efflux at pHi 6.90.
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