Monoamine oxidase

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monoamine oxidase (MAO) (mon-oh-ay-meen) n. an enzyme that catalyses the oxidation of a large variety of monoamines, including adrenaline, noradrenaline, and serotonin. Monoamine oxidase is found in most tissues, particularly the liver and nervous system. See also MAO inhibitor.

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monoamine oxidase (MAO) An enzyme that breaks down monoamines (e.g. adrenaline and noradrenaline) in the body by oxidation. Drugs that inhibit this enzyme are used to treat forms of depression.

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monoamine oxidase Enzyme that oxidises amines; inhibitors have been used clinically as antidepressant drugs, and consumption of amine‐rich foods such as cheese may cause a hypertensive crisis in people taking the inhibitors.