||A group of enzymes that oxidize diamines, such as histamine, and also some primary monoamines but have little or no activity towards secondary and tertiary amines. They are copper quinoproteins (2,4,5-trihydroxyphenylalanine quinone) and, like EC 126.96.36.199 (primary-amine oxidase) but unlike EC 188.8.131.52 (monoamine oxidase), they are sensitive to inhibition by carbonyl-group reagents, such as semicarbazide.
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