Monoamine oxidases (MAO) are crucial enzymes that oxidatively deaminate monoamines (amines that have only one amino group, such as serotonin, epinephrine, norepinephrine, dopamine, tyramine, and tryptamine). There are two main forms of MAO. MAO-A predominates in the gut, spleen, and pancreas, and especially the placenta, and is inhibited by clorgyline . MAO-B predominates in the human brain, skin, and skeletal muscle and is inhibited by deprenyl and pargyline . Recent reviews of MAO inhibitors (MAOI) are available .
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