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The kynurenine pathway of tryptophan (TRP) metabolism. Note: enzymes are highlighted in red. IDO: indoleamine 2,3-dioxygenase; TDO2: tryptophan 2,3-dioxygenase; KAT: kynurenine aminotransferases; KMO: kynurenine 3-monooxygenase; 3HDO: 3-hydroxyanthranilic acid oxygenase.
