Behavior of P-sel^ΔCT/ΔCT mice in the social recognition test is severely impaired. (A) Total time(s) spent by adult mice investigating a juvenile. Males and females were analyzed separately in 2 trials (I and II). Error bars indicate SEM. (B) Aggressive behavior (adult mouse attacking juvenile) is shown as the percentage of mice that showed aggressive behavior toward the juvenile. n = 7-21 males; n = 4-8 females.