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(A) Equivalent circuit of Ohmic ion currents across a capacitive membrane. (B) Time course of membrane potential with countercurrent (solid line) and without (dashed line) for the equivalent circuit in panel A. (C) Time course of Ca2+ current with countercurrent (solid line) and without (dashed line) for the equivalent circuit in panel A. gK = 100 pS, gCa = 25 pS, EK = 0 mV, and ECa = −120 mV.
