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Currents activated by Pi in the presence of MgATP. (A) Patch recording at −50 mV with NMG+o pH 6 in the pipette. IH was activated by the indicated [Pi] in solution with 20 mM K+i and 4 mM ATP. (B) I-V plot showing Pi+ATP-activated IH normalized to IH activated by 20 mM Na+i+ATP at −140 mV (n = 2). To see this figure in color, go online.
