FMO2 (Flavin Containing Monooxygenase 2): FMO2 is an enzyme that plays a key role in the metabolism of xenobiotics, drugs, and other foreign compounds. Using flavin adenine dinucleotide (FAD) as a cofactor, it helps detoxify nitrogen-containing substances. FMO2 is primarily expressed in the lungs, and genetic variants can affect its activity, influencing individual responses to certain medications and environmental toxins.