Monoamine oxidase A, also known as MAO-A, is an enzyme that in humans is encoded by the MAOA gene. Monoamine oxidase A is an isozyme of monoamine oxidase. It preferentially deaminates norepinephrine (noradrenaline), epinephrine (adrenaline), serotonin, and dopamine (which is equally deaminated by MAO-A and MAO-B). It is inhibited by clorgyline and...