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Concentration-dependent vasorelaxant response of (A) the crude extract of Rumex acetosa (Ra.Cr); (C) verapamil on phenylephrine (PE 1 µM) and K+ (80 mM) precontractions and on baseline tension, (B,D) respectively, their effect on the sigmoidal CaCl2 concentration–response curves, constructed in Ca2+-free medium, in isolated rabbit aorta preparations. Values shown are mean ± SEM. Five to six determinations.
