Effect of fluoxetine on social play behaviour in peri-adolescent male wild-type rats. Thirty minutes before the 15-min test, the animals were treated with 1 (a, b) or 10 mg/kg (c, d) fluoxetine (s.c.). The data represent mean ± SEM of the number of pins, pounces and boxing/wresting episodes (a, c) and mean ± SEM of the duration of social exploration, following/chasing and social grooming (b, d). Asterisk, p < 0.05 vs saline