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Serum neurotransmitter abundance in mice aged 9 weeks (Wilcoxon rank-sum test). (a) The level of serotonin. (b) The level of tryptamine. (c) The level of 5-Hydroxyindoleacetic acid. (d) The level of glutamic acid. (e)The level of 3-Hydroxytyramine. (f) The level of choline. Dots indicate single mice. *, p < 0.05; **, p < 0.01; and ***, p < 0.001. Data are plotted as ±standard deviation.
