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Steady-state activation. (A–E) A P1 pulse was applied from the holding potential of −90 mV to voltages between −60 and +60 for 5 s, followed by a P2 pulse to −40 mV (see inset) for all models. (F) Relative magnitude of the peak P2 current versus P1 voltage. (Lines) Fits to Boltzmann relationship (1/(1 + exp((V–V1/2)/k))). V1/2 values were similar for all models: WLMSR −27.7 mV; MGWMN −14.6 mV; ZLRR −21.5 mV; OGD −17.7 mV; CR −21.0 mV.
