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Voltage dependence of mean open time for the single-channel Rb current of R128Y in Figure 9, compared to wt-Kir1.1 Rb permeation (dashed line). The data were fit to a simple exponential: Tau (open time) = α•exp(β•V), where α = 3280 for R128Y and 58 for wt, and β = 0.03 for R128Y and 0.02 for wt.
