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Steady-state current–voltage relation,ISS versus V, for the model, showing the effects of blocking either or both of the two K+ currents of the model. A, Large “bump” in ISS in the voltage range of −60 to −40 mV is caused by the (outward) window current ofIA. The modest “trough” inISS at approximately −70 mV is caused by the (inward) window current of IT at steady state. This N-shaped region of ISS is seen better in the magnification in B. B, Part of A is magnified.
