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Concentration–response curves for anandamide-induced relaxation of endothelium-denuded rat isolated mesenteric artery. (a) Relaxation was elicited by anandamide alone or in the presence of 3 μM SR 141716A, 10 μM capsaicin or 3 μM SR 141716A plus 10 μM capsaicin. n=4–7. Values are shown as means and vertical lines represent s.e.m.
