E1C currents after superfusion of MTSES⁻ or MTSET⁺. (A; left) Oocytes were repeatedly held at −80 mV for 32 s, depolarized at +40 mV for 5 s, and repolarized at −40 mV for 3 s. Scale, 2 µA. (Middle) Peak current amplitudes at +40 mV plotted against time. (Right) Normalized peak current amplitude after various MTS treatments. Error bars represent standard error of the means. (B; left) E1C+KCNE1 currents after superfusion of MTSES⁻, MTSET⁺, or MTSACE. Same protocol used as in A. Scale, 3 µA. (Middle) peak current amplitudes at +40 mV plotted against time. (Right) Normalized peak current amplitude after various MTS treatments. Error bars represent standard error of the means.