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Extracts from several different parts of C. japonica cause endothelium-dependent relaxations in the porcine coronary artery. Arterial rings with endothelium were contracted with U46619 before the addition of increasing concentrations of either leaf, stem, fruit, or flower of C. japonica. The relaxation response is expressed as the percentage relaxation of the U46619-induced contraction. Results are shown as means ± SEM (n = 6).
