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Typical tracing showing inhibitory effect of (A) increasing concentrations of the crude extract of Rumex acetosa (Ra.Cr) on the initial peak formation of phenylephrine (1 µM)-induced contractions in Ca2+-free medium. (B) The effect of Ra.Cr. (C) The effect of verapamil in isolated rabbit aorta preparations. Values shown are mean ± SEM. Five to six determinations.
