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This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with oxygen as acceptor. The systematic name of this enzyme class is N-acetylindoxyl:oxygen oxidoreductase. This enzyme participates in tryptophan metabolism.
References
BEEVERS H, FRENCH RC (1954). "Oxidation of N-acetylindoxyl by an enzyme from plants". Arch. Biochem. Biophys. 50 (2): 427–39. doi:10.1016/0003-9861(54)90059-4. PMID13159343.