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Effect of purinoceptor antagonists on mesenteric artery contractions evoked by ATP (a) and UTP (b); 100 μM suramin, 100 μM PPADS, 10 μM MRS2567 and 10 μΜ NF023 were added 10 min before the treatment of mesenteric arteries with 100 μM ATP or UTP. Maximal values of contractions measured in the absence of purinergic antagonists were taken as 100%. Means ± S.E. of three independent experiments are reported. *p < 0.02
