BDNF gene expression in the basal forebrain, frontal cortex and hypothalamus in male and female rats during adolescence and adulthood. Males: n = 5/CTRL group, n = 6/CF group, females: n = 6/CTRL group, n = 6/CF group. In the basal forebrain, BDNF gene expression level was higher in adolescence than in adulthood (factorial ANOVA (factors: sex, age and treatment), P < 0.05) and tended to be lower in CF rats than in CTRLs (factorial ANOVA (factors: sex, age and treatment), P = 0.08). Such differences were not observed in other brain areas. CTRL, control rats; CF, cross-fostering rats.