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Effects of flavonoids on relaxation in aortic rings with endothelium pre-contracted with 1 μM phenylephrine. Flavonoids were added cumulatively to achieve the appropriate concentrations. Results are expressed as means ± standard error of mean in terms of percentage relaxation of the contraction to PE (n = 3 ~ 4). (A) Flavonoids with highly vasorelaxation effect; (B) Flavonoids with weakly vasorelaxation effect.
