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Temporary reduction in [Ca2+]o abolishes LTP.A, Incidence of LTP (>15% increase from the baseline at 40–50 min after HFS) plotted against [Ca2+]o with figures indicating the number of tested cells. B, C, [Ca2+]o was changed between 4 and 2.4 mm, indicated in the middle. The number of cells was six (B) and five (C). Squares andtriangles represent responses for conditioned and unconditioned pathways, respectively.
