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Effect of serotonin (5-HT) concentration on airway contractility during electric field stimulation (EFS). *Tension production in O3 + HDMA group is significantly greater than in the FA group at 100 μM 5-HT. †In the O3 + HDMA group, tension production at each 5-HT concentration was greater than the control response. Control response is defined as the amount of tension produced via EFS before addition of 5-HT. There was no within-group effect seen in the FA group (P > 0.05; n = 6).
