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Concentration inhibition curves for prazosin, BMY 7378 and 5-methylurapidil, added after (CICa) or before (CICb) the maximal noradrenaline-induced contraction in tail artery and aorta, in Ca2+-containing (CICb Ca (+)) or Ca2+-free solution (CICB Ca (−)). Data are mean±s.e.mean of 5–9 experiments. The pIC50 values are shown in Tables 2 and 3.
