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Effect of preincubation with a 5-HT2 receptor antagonist on 5-HT concentration response in the HDMA group; tension response to EFS. * Tension is significantly less than 0 µM KET at the same 5-HT concentration. † Tension is significantly less than 1 µM KET at the same 5-HT concentration. Values are means ± SE, n = 6 (p < 0.05). KET = Ketanserin.
