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Luteolin-induced vasoralaxation capacity depends on preconstrictors. After depolarized with KCL and washed with KH buffer, Aortic rings were contracted by PE or KCL at the half-log concentration for 15 min. The relaxation responses of vessel rings to incremental concentrations of luteolin were then evaluated. Data are expressed as mean ± SE derived from three separate experiments. * P<0.05 vs. vehicle-treated control.
