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Inhibitory concentration-response curves of isoprenaline against carbachol (CCh)-induced contractions in the absence and presence of different concentrations of (a) crude extract of Lepidium sativum (Ls.Cr) and (b) rolipram in isolated guinea-pig tracheal preparations, n = 3. The curves obtained by pretreatment of tissues with Ls.Cr and rolipram are significantly different from the respective isoprenaline control curves (P < 0.05), Student's t-test.
