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Tryptophan – Kynurenine pathway.
Abbreviations: TRP: tryptophan; KYN: kynurenine; AA: anthranilic acid; B-2: riboflavin; 3-HK: 3hydroxykynurenine; KYNA: kynurenic acid; XA: xanthurenic acid; IDO: indoleamine 2,3-dioxygenase; TDO: tryptophan 2,3-dioxygenase; NAD+ : nicotinamide adenine dinucleotide
