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. 1998 Nov 2;143(3):767–775. doi: 10.1083/jcb.143.3.767

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(A) Normalized current–voltage relationships in an inside-out patch from an oocyte expressing rectifying currents in the presence of different internal Na⁺ concentrations. The stimulation protocol was as the one in Fig. 2. (B) Dose–response plots for effects of Na⁺. The solid lines are fits to the Hill equation. (C) IC₅₀ plotted versus voltage. The exponential fit to Eq. 1 gave a value for δ of 0.446.