Monoamine receptor

A monoamine receptor is a receptor for the monoamine neurotransmitters and/or trace amines, endogenoussmall-moleculesignaling molecules with a monoaminestructure. The monoamine receptors are almost all G protein-coupled receptors, with the serotonin5-HT₃ receptor being a notable exception as a ligand-gated ion channel. Monoamine receptors are the biological targets of many drugs; such drugs may be referred to as "monoaminergic".