Figure 2From: Potassium channel openers and prostacyclin play a crucial role in mediating the vasorelaxant activity of Gynura procumbens Concentration-relaxation curves for the BU fraction in the isolated rat aortic rings. The BU-induced relaxation was studied on endothelium-intact aortic rings precontracted with either PE or KCl. Values are mean ± S.E.M (n = 8).Back to article page