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FMO5, also known as Dimethylaniline monooxygenase [N-oxide-forming] 5, has a 533 amino acid long isoform that is 60 kDa and a short 285 amino acid isoform that is 32 kDa; is most often expressed in adult and fetal liver, and in contrast with other forms of FMO it does not seem to be a drug-metabolizing enzyme. This protein has been studied for its involvement in trimethylaminuria, hearing loss, hepatitis, and atrioventricular septal defect. FMO5 interacts with CYP3A5, CYP3A43, CYP2D6, CYP3A7, and CYP3A4 and it has been linked to Busulfan Q06828 (pharmacodynamics) and drug metabolism - cytochrome P450 pathways .