Facial withdrawal thresholds were measured in (A) male and (B) female mice following acute stress (n = 8 male, 8 female). Following the final day of stress, animals were tested out to 35 days and received either 0.1 mg/kg SNP (n = 8 males, n = 9 females) or vehicle (n = 9 males, n = 8 females). All controls received SNP. (†) denotes statistical significance between stressed mice will receive SNP and control mice. (*) denotes statistical significance between stressed mice that will receive vehicle and control mice. (§) denotes statistical significance between stressed mice that received vehicle and stressed miced that received SNP. Two-way RM ANOVA with Bonferroni multiple comparison analysis indicated a significant difference between stressed and control mice in the acute phase, but revealed no significant differences following administration of SNP. Data are represented as means ± SEM. *p<0.05, ††††,****p<0.0001. See Table 2 for additional results of analysis.