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Mean dose-response curves for NO (0.1–150 μmoles)-evoked relaxation (a) and hyperpolarization (b) in the absence and presence of ODQ (10 μM) and ChTX (50 nM) alone and in combination. All points are the mean of 3–8 observations with s.e.means shown by vertical lines. *P<0.01 compared to control values.
