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Dose-dependent inhibitory effect of the aqueous-methanol extract of P. verticillatum Rhizomes, PR (a) and verapamil (c) on carbachol (CCh) and K+ (80 mM)-induced contractions, and the dose–response curves of Ca2+ created in the absence and presence of increasing concentrations of PR (b) and verapamil (d) in isolated guinea-pig jejunum preparation. Data stand for mean ± SEM of 3–5 different experimental findings.
