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Action potential currents in P. caudatum (from Brehm and Eckert, 1978a, with permission). A, Current recorded in voltage-clamp with different depolarization steps above resting potential. The first and last peaks are capacitive transients. The early negative transient is mediated by calcium; the late positive current is mediated by potassium. B, Early and late currents versus membrane potential (relative to rest).
