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Analysis of the ATP-induced smooth patch current component. ATP4− dependence of activation and deactivation time constants (A), the linearly activating component s (B), and the amplitude of the activating current (C). (D) Dependence of the exponentially activating current amplitude iact,∞ evoked by 1 mM ATP4− on the current before ATP application. Vh = −120 mV, N = 5–20 patches from 20 different oocytes.
