In the 3-chamber test, the cKO mice exhibited a decreased interest for the stranger mouse (S1) against objects (O) compared to the CTL group (nCTL=12, ncKO=14, unpaired Student t-test). F. When cKO mice were exposed to a new stranger mouse (S2) against the familiar S1 mouse, they also showed a decreased interest for the S2 mouse compared to that of the CTL group. The preference index showed the decreased sociability of the cKO group in both sessions (nCTL=12, ncKO=14, unpaired Student t-test). Data information: All data are presented as mean values ± s.e.m. 