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Main routes of tryptophan metabolism in microbiota. TMO, Tryptophan 2-monoxygenase, TrD, Tryptophan decarboxylase, ILDHase, Indole-3-lactic acid dehydrogenase, ArAT, Aromatic amino acid aminotransferases, TNA, Tryptophanase, IAAld (Indole-3-acetaldehyde) dehydrogenase. * Indicates known AhR ligands.
