FMO4 (Flavin Containing Monooxygenase 4): FMO4 is an enzyme belonging to the flavin-containing monooxygenase family. It plays a key role in the detoxification process by catalyzing the oxidation of various compounds, including drugs, xenobiotics, and endogenous molecules. Primarily expressed in the liver, FMO4 helps regulate the metabolism and elimination of substances, which can impact drug effectiveness and toxicity. Ongoing research explores its significance in metabolic pathways and its potential effects on pharmacology and toxicology.