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Effect of cumulative concentrations of NaHS on rat trachea contractions (mean±SEM) induced by KCl (60 mM, n= 8) before and after incubation with L-NAME (300 μM, n=8) and propranolol (Prop, 1 μM, n= 10). L-NAME and propranolol did not reduce the NaHS relaxant effect but rather potentiated this effect significantly (two-ways ANOVA, P< 0.001).
