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(A) Animals of all cohorts displayed no significant chamber-exploration bias. (B) All cohorts displayed normal sociability by spending significantly more time with a novel mouse (stimulus 1). (C) Sham-irradiated and mice receiving 0.1 Gy were able to discriminate between a novel stranger (Stimulus 2), and a now-familiar stranger (Stimulus 1), whereas mice treated with 0.25 Gy failed to distinguish strangers. Average ± SEM (n = 12); *P < 0.05, **P < 0.0001.
