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Concentration–response curves of Ca+2 (CRCs) in the absence and the presence of (a) crude extract of N. ruderalis (Nr.Cr) and (b) verapamil on isolated rabbit trachea. Values are expressed as mean ± SEM, n = 3, *p < 0.05, **p < 0.01 versus control, one-way ANOVA, followed by Dunnett’s test.
