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Cumulative concentration-response curves (0.1 to 30 μg/mL) for butanolic fraction (BF) of C. brasiliense leaves in rats aortic rings with intact or denuded endothelium precontracted with phenylephrine (Phe) (0.1 μM). The results show the mean ± SEM of 6–8 experiments. *P < 0.05 when compared to endothelium-denuded aortic rings.
