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. 1997 Apr 1;109(4):463–475. doi: 10.1085/jgp.109.4.463

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Divalent permeation of K1237C. (A) Current recordings of K1237C in the presence of 96 mM Na⁺, Ca²⁺, Sr²⁺, Mg²⁺, and Ba²⁺ solutions. Currents were recorded as described in Fig. 4. (B) Corresponding current-voltage relationship from the same oocyte shown in A. Data were fit as described in Fig. 4. (C) Conductance-voltage relationship of K1237C in the presence of Na⁺ and the divalent cations. Symbols are the same as denoted in B. Data were normalized to the maximal Na⁺ conductance and fit to a Boltzmann distribution function. Values represent the mean ± SEM of five oocytes.