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Fig. 2. Effects of serotonin on the behavioral response of the male moth to
different concentrations of artificial pheromone. 4 µl of 10-4
mol l-1 serotonin were applied to the desheathed brain 3 min before
pheromone exposure. Sample size: control (N=76), serotonin
(N=73), wash (N=75). Serotonin shifted the curve to the
left; its effect was higher than the control and the wash (GLM,
P<0.05).