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a Typical recording illustrating the effects of 80 mM KCl, 100 μM α,β-ATP, and 100 μM UDP on the internal diameter of mouse resistance mesenteric arteries. b Dose-dependent actions of ATP, UTP, UDP, and α,β-ATP on mesenteric artery contractions. Maximal values of contractions evoked by 80 mM KCl were taken as 100%. Means ± S.E. of three independent experiments are shown
