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Individual and grouped data showing the age‐related differences between Tph2 −/− and Tph2 +/+ mice on respiratory equivalent (V E/VO2). Younger – Tph2 +/+ (n = 3), Tph2 −/− (n = 5); Older – Tph2 +/+ (n = 5), Tph2 −/− (n = 5). Tph, tryptophan hydroxylase. **p < 0.01—effect of genotype using two‐way ANOVA
