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NAD biosynthesis
tryptophan catabolism (early stages)
EC 1.2.1.32 aminomuconate-semialdehyde dehydrogenase
EC 1.13.11.6 3-hydroxyanthranilate 3,4-dioxygenase
EC 4.1.1.45 aminocarboxymuconate-semialdehyde decarboxylase