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Ionic and gating currents for (α)BK and (α/βx)BK channels. (A–E, Left) Representative families of IK evoked by voltage steps of 50 ms for (α)BK and 120 ms for the α/βx complexes, going from 0 to 250 mV in 10-mV steps. Ionic currents were recorded in 1-mM symmetrical K+ and ∼5 nM Ca2+. (A–E, Right) Gating currents elicited by 1-ms steps to increasing voltages from −90 to 350 mV in increments of 10 mV; pulse duration was set to reach a quasi steady state.
