FMO2 (Flavin Containing Monooxygenase 2): FMO2 is an enzyme that plays a crucial role in the metabolism of xenobiotics, drugs, and other foreign compounds. It utilizes flavin adenine dinucleotide (FAD) as a cofactor to help detoxify nitrogen-containing substances. FMO2 is mainly expressed in the lungs, and genetic variations can impact its activity, affecting individual responses to certain medications and environmental toxins.