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Current-voltage relationships of single-channel currents. Mean I-V relationship of single-channel currents from outside-out patches activated by pHo of 4.0 recorded at membrane potentials from −100 to −20 mV. External solution contained 150 mM of Na+, Li+, or K+, and internal solution contained 150 mM K+. Data points represent the mean of at least three independent measurements. The error bars indicate ±SD.
