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Concentration-response curves showing comparison of (A) Thymus serrulatus essential oil (TS Oil), (B) dicylomine, (C) verapamil, and (D) atropine for the inhibitory effect against carbachol (CCh) and high K + -induced contractions in isolated guinea-pig tracheal preparations. Values shown are mean ± SEM of 3–5 individual experiments conducted on the isolated tracheal tissue preparations from 3 to 5 different guinea-pigs.
