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. 2021 Sep 3;121(12):3379–3387. doi: 10.1007/s00421-021-04735-z

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© The Author(s) 2021, corrected publication 2022

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Fig. 1 — Major metabolites of the Tryptophan metabolism pathway in humans. IDO indoleamine 2,3-dioxygenase; TDO Tryptophan 2,3-dioxygenase; KAT KYN aminotrasferase I; KMO KYN monooxygenase; 3-HK 3-hudroxyKynurenine; KYNU Kynureninase (Pal et al. 2021)