In the EPM task, the time spent in the open arms was significantly decreased in cKO mice compared to that in the control (CTL) group (nCTL=20, ncKO=12, unpaired Student t-test). B. In the LDB task, the time spent in the light zone by cKO mice was significantly decreased compared to that spent by the CTL mice (nCTL=20, ncKO=12, unpaired Student t-test). C. In the PA task, the entry latency of cKO mice was significantly decreased compared to that of the CTL mice (nCTL=20, ncKO=12, unpaired Student t-test)..D. Nestlet shredding behaviors of the cKO group were also decreased compared to those of the CTL group. The weight of the shredded nestlets of the cKO group was significantly lower than that of the CTL group (nCTL=20, ncKO=12, unpaired Student t-test). 