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The kynurenine pathway and the NAD+ salvage pathway. IDO: Indoleamine-pyrrole 2,3-dioxygenase; TDO: Tryptophan 2,3-dioxygenase; KATs: Kynurenine aminotransferase; KMO: Kynurenine 3-monooxygenase; 3HAO: 3-hydroxyanthranilate oxidase; QPRT: Quinolinate phosphoribosyl transferase; ACMSD: ACMS decarboxylase.
