C57BL/6 mice were anesthetized with isoflurane after the completion of social aggression. Mus (40 ng/0.25 µl) or an equal volume of saline was bilaterally injected into the BLA (bregma coordinates: AP − 1.7 mm; ML ± 3.3 mm; DV − 3.8 mm from the brain surface). After 3 days, mice were sacrificed following behavioral examination.