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Effects of EGTA (0.5 mmol l−1 with nominally Ca2+-free buffer in the organ bath) and nitrendipine (300 nmol l−1) treatment on SPPC-induced contraction of rat mesenteric microvessels in vitro. Data are mean±s.e.mean (n=11–13) and normalized as % of maximal noradrenaline values (≈18 mN). Nitrendipine significantly attenuated SPPC-induced vasoconstriction (P<0.05 in a two-way analysis of variance) compared to controls, while EGTA abolished it.
