FMO4 (Flavin Containing Monooxygenase 4): FMO4 is an enzyme from the flavin-containing monooxygenase family. It plays a crucial role in the detoxification process by catalyzing the oxidation of various compounds, including drugs, xenobiotics, and endogenous molecules. Mainly expressed in the liver, FMO4 helps regulate the metabolism and elimination of substances, which can affect drug efficacy and toxicity. Ongoing research investigates its importance in metabolic pathways and its potential impact on pharmacology and toxicology.