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Brain (A) and liver (B) levels of kynurenine, 3-hydroxykynurenine (3-HK), and quinolinic acid (QUIN) in wild-type (open bars) and mKat-2−/− (solid bars) mice at various ages. Data are from 5 to 12 animals per age group and are expressed as the mean ± the standard error of the mean.
