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Analysis of clock genes expression in TPH2+/+and TPH2−/− stressed rats. The data are expressed as percentage of TPH2+/+/naïve (set at 100%) and are represented as mean ± SEM of independent determinations. **p < 0.01; ***p < 0.001 vs. TPH2+/+/naïve; ##p < 0.01; ###p < 0.001 vs. TPH2−/−/naïve; ∧p < 0.05; ∧∧p < 0.01; vs. TPH2+/+/stress (two-way ANOVA with Fisher’s PLSD).
