Monoamine oxidase (MAO) is an enzyme found in the body that plays a crucial role in breaking down neurotransmitters. These neurotransmitters, such as serotonin, dopamine, and norepinephrine, are important for regulating mood, emotions, and various bodily functions. By metabolizing these chemicals, MAO helps maintain their balance in the brain. There are two main types of monoamine oxidase: MAO-A and MAO-B. Each type targets different neurotransmitters and has distinct functions. MAO-A primarily breaks down serotonin and norepinephrine, while MAO-B mainly affects dopamine. Understanding MAO's role is important for developing treatments for mood disorders and other neurological conditions.