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Cumulative concentration-response curves (0.1 to 30 μg/mL) for crude hydroalcoholic extract (CHE), hexane fraction (HF), chloroform fraction (CF), ethyl acetate fraction (EAF), and butanolic fraction (BF) of C. brasiliense leaves in rats aortic rings with intact endothelium precontracted with phenylephrine (Phe) (0.1 μM). The results show the mean ± SEM of 6–8 experiments. *P < 0.05 when compared to vehicle (DMSO).
