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Duration of test time (sec) spent in prosocial contact with a novel, same-sex conspecific. Pre-weaning (PND15) males spent significantly more time in prosocial contact than older males (PND30-PND60). Box plots show the median (black line), 75th and 25th percentiles (box), and 95% confidence interval (whiskers). Letters above graphs (A, B) indicate statistical similarity.
