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Reversal of synaptic events induced by CCh in a layer II SC. A, A long trace of activity induced by 30 μm CCh. B, Alterations in amplitude and direction of potential changes induced by depolarizing and hyperpolarizing current injection. At potentials near and just above the firing threshold of the cell, the intracellular trace appears biphasic, with an initial component reversing at approximately −50 mV (arrow) and another reversing approximately 5–10 mV more positive (asterisk).
