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Social play behaviour in peri-adolescent male SERT−/− and SERT+/+ rats. The data represent mean ± SEM of the number of pins, pounces and boxing/wresting episodes (a) and mean ± SEM of the duration of social exploration and following/chasing (b) during a 15 min test. Asterisk, p < 0.05 SERT−/− vs SERT+/+
