. . . . "moleculaire functie"@nl . . . "GO:0033754"@en . . . "1.13.11.52" . "GO:0033754" . "Catalysis of the reaction: tryptophan + O2 = N-formylkynurenine. The product of the reaction depends on the substrate; D-tryptophan produces N-formyl-D-kynurenine, and L-tryptophan produces N-formyl-L-kynurenine."@en . . "indoleamine 2,3-dioxygenase activity"@en . . . "indoleamine 2,3-dioxygenase activity"@en . "indoleamine 2,3-dioxygenase activity"@en . . . . . . .