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Relaxant effect of hibiscus sabdariffa calyces crude extract (10-4 to 10-1g/l) in aortic rings with endothelium (Control) precontracted with norepinephrine (10-8 to 10-6M) or after treatment with inhibitors. Values are expressed as mean ± SEM of 4-6 experiments; ns: not significant; *:P < 0.05, ** P < 0.01, in comparison to control.
