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The releasable vesicle pool size in EINs.A, Graph showing the depression of an EIN–evoked EPSP in a single connection, illustrating the parameters used to estimate the available vesicle numbers. B, Histogram showing vesicle numbers in all depressing connections and in P1 and P2 connections. The estimated releasable vesicle pool was significantly larger at P1 than at P2 connections.
