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Plasma corticosterone concentrations (ng/mL) from adolescents (left) and adults (right), collected either immediately from animals taken directly out of the homecage (Hc) or 30 min after saline injection (Inj) in Experiment 2a. *Significantly lower (p<0.05) corticosterone level in handled than nonhandled animals at the same age (based on Fischer’s post hoc analysis of the significant handling×killing condition interaction).
