CG32572BG01683 homozygous males have significantly decreased levels of aggression. (P < 0.0001; Male aggression index = 7.65). The mushroom body alpha lobes in these animals are significantly longer and wider, relative to overall brain size, than in wild-type (P < 0.00 ). In some cases beta-lobes are missing altogether.
Precise excision of the P{GT1}CG32572BG01683 leads to only reversion of the decreased aggression phenotype seen in P{GT1}CG32572BG01683 males.