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Monoamine oxidase (MAO) converts serotonin to 5-hydroxyindoleacetic acid (HIAA) MAO will oxidatively deaminate compounds having an amino group attached to a carbon atom. This is similar to degra- dation of epinephrine .MAO inhibitors (e.g. iproniazid) will cause mood elevation. Small portion of serotonin is conjugated with sulfate or with glucuronic acid, and excreted through urine.