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▪, 10 μm ACh (n = 5 for NO, n = 7 for RVC); •, 100 μm ACh (n = 6 for NO, n = 15 for RVC); □, 100 μm ACh plus 30 μml-NNA (n = 4 for NO, n = 5 for RVC). Mean ± s.e.m.
