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Serine system disturbance in the DM. a Concentration of d-serine in the PFc of the DM. b The mRNA expression levels of serine racemase in the PFc of the DM. c The mRNA expression levels of d-amino acid oxidase in the PFc of the DM. N = 8 for a, N = 14 for b, N = 13–14 for c. Values are means ± SE. Statistical differences between two groups were analyzed with the t test (*P < 0.05)
