Abstract
Monoamine oxidase (MAO) catalyzes the oxidative deamination of a number of biogenic amines, including the key neurotransmitters serotonin (5-HT), norepinephrine (NE), and dopamine (DA) and the neuromodulator phenylethylamine (PEA). Two forms of MAO, designated “MAO A” and “MAO B,” have been identified on the basis of biochemical properties and, subsequently, by cloning the relevant genes. Of the two, MAO A exhibits a higher affinity for 5-HT and NE and for the inhibitor clorgyline (Johnston 1968), whereas MAO B has a higher affinity for PEA, benzylamine, and the inhibitor deprenyl (Knoll and Magyar 1972).
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