Fig. 1.

The effect of crowding stress (CS) for 3, 7, and 14 days on nNOS (a) and iNOS (b) levels in the prefrontal cortex. Rats were exposed to crowding stress (24 animals per cage) for 3, 7, and 14 consecutive days and decapitated. The panels above show representative immunoblots showing the expression of nNOS (a) and iNOS (b) in the prefrontal cortex. Graphs represent the means ± SEM of 10–12 rats per group. Data were assessed by one-way ANOVA followed by Newman’s test: ++ p < 0.01 vs. non-stressed control group