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Fig. 8. Daily variation of the male B. mori's behavior to different
concentrations of artificial pheromone. Period during which the light was
turned off is indicated by a gray bar along the x-axis. The
N values for each group varied between 41 and 88. Around noon (10.00
h and 12.00 h),moths showed highest sensitivity to pheromone, significantly
higher than during scotophase (GLM, P<0.05). The daily behavioral
response to pheromone was strongly correlated to the daily variation of
serotonin in the moth's brain (Fig.
7) (Pearson correlation coefficient: >0.90 for 0.1 ng, 0.5 ng
and 1 ng).