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Contractile response to exogenous NA (n=4–6) (a), and α,β-meATP (n=4–6) (b), in the absence (control) and in the presence of the cannabinoid receptor agonists, CP55,940, anandamide or WIN55,212-2 with tone raised by U46619. Data are shown as mean±s.e.m. There was no significant difference between the groups (ANOVA). α,β-meATP, α, β-methylene ATP; ANOVA, analysis of variance; NA, noradrenaline.
