Figure 6.

Enhancement of contextual fear memory in S100B-null mice. (A) Movements of mice were monitored in a shock chamber for 5 min and percentage of freezing rate in each 1 min was plotted. Arrowhead indicates the time when the mice were conditioned by an electrical foot shock. Mutant mice (n = 11) had higher freezing rate than wild-type mice (n = 12) at 24 h after conditioning. (B) Each column represents averaged percentage of freezing rate during a 5-min recording period at 24 h after conditioning. Data represent mean ± SE. *, P < 0.05; **, P < 0.01.