Monooksigenaze koje sarže flavin su NADPH zavisni enzimi koji katalizuju oksidaciju mnogih lekova i ksenobiotika. Kod većine sisara, monooksigenaze koje sadrže flavin katalizuju N-oksidaciju primarnih alkilamina putem N-hidroksilaminskih intermedijera. Međutim, kod ljudi ovaj enzim je okrnjen i verovatno se brzo ralaže. Protein kodiran ovim genom predstavlja skraćenu formu is stoga nema kataličko dejstvo. Objavljeno je da je kod afričkih amerikanaca funkcionalni alil prisutan, ali evidencija u vidu sekvence nije dostupna u prilog toj tvrdnji. Ovaj gen je lociran u klasteru sa FMO1, FMO3, i FMO4 genima na hromozomu 1.[6]
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