FMO4 (Flavin Containing Monooxygenase 4): FMO4 is an enzyme that belongs to the flavin-containing monooxygenase family. It plays a crucial role in the detoxification process by catalysing 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 impacts on pharmacology and toxicology.