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(A) Current responses to hyperpolarizing voltage steps to −120 mV for 1 s and tail currents recorded by stepping the voltage to the indicated value (see voltage protocol above the current traces). The arrow indicates the instantaneous tail-current amplitudes used for the I/Vm relation shown in B. (B) Instantaneous I/Vm relation derived from tail currents in A. The reversal potential was −22 mV.
