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Figure S1. Currents in untransfected HEK 293 cells. Currents were recorded by the protocol of Fig. 2. 5-ms steps to voltages from -100 to +200 mV, from a holding potential of -100 mV. Currents were measured at the end of each step, and are shown without leak subtraction (A), or with online P/-4 subtraction (B). n = 5.