What is monoamine oxidase (MAO)? No, “MAO” doesn’t refer to Chairman Mao, former leader of China. 🙂 Monoamine oxidase is an enzyme that breaks down monoamines like dopamine, norepinephrine, and serotonin. That is why it is very important in relation to mental health. Where is MAO present? It is present in neurons that release dopamine, norepinephrine, and…