Figure 11.

Histograms for the R128Y inward Rb current of Figure 9 at a V_pch of -120 mV (inside negative). Oocyte was bathed in 10 mM K, 0 Mg, 2 mM Ca, which depolarized the oocyte to -45 mV. Pipette: 100 RbCl, 0 Mg, 2 Ca, 0.5 mM LaCl₃ at a pipette holding potential of +75 mV. (a) Mean open time = 129 ms (1,254 events, one channel). (B) Two closed states with mean closed times = 13 ms (88%) and 905 ms (12%).