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Inactivation of the calcium current by a preceding depolarization in control and in mdx fibers. (A) Pulse protocol. (B) Membrane current traces obtained in response to the protocol shown in (A) in a control fiber. (C) Dependence of the mean normalized peak current measured in response to the test pulse upon the command voltage during the preceding depolarization, in control fibers (solid circles, n = 6) and in mdx fibers (open circles, n = 4).
