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Concentration–response curve for the relaxation of isolated rat aorta rings, precontracted by phenylephrine (1 μM), by anandamide in the presence or absence of functional endothelium. Values are expressed as mean±s.e. for 4–8 animals. A two-way analysis of variance followed by Bonferroni/Dunn post hoc test was used for statistical analysis (*P<0.05, **P<0.01, ***P<0.001 vs control).
