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(A) Responses from two CA3 neurons in response to four photostimulations for each cell. (Scale, 50 ms and 20 mV.) (B) EPSCs from a CA1 neuron in response to multiple photostimulations at the same site in CA3. Arrow, onset of photostimulation. (Scale, 25 ms and 20 pA.) (C) Total charge transfer for a CA1 neuron as a function of the number of measured EPSCs for that cell. (Scale, 25 ms and 20 pA.)
