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Fig. 4. (A) Pre-injection with ketanserin caused a significant inhibition of the {alpha}-methyl-5-HT-mediated effect. (B) Ketanserin mediated a dose-dependent decrease in pulse size. (C) The percentage of fish that pulsed following agonist injection. All values are means ± 1 S.E.M.; *P<0.05, significantly different from value at t=0; {dagger}P<0.05 compared with {alpha}-methyl-5HT injection alone.