<unk> s are a family of cation-permeable ligand gated ion channels that open in response to extracellular adenosine 5'-triphosphate (ATP). They belong to a larger family of receptors known as the purinergic receptors.<unk> s are present in a diverse array of organisms including amoeba (1), fluke, zebrafish, bullfrog, chicken, mouse, rat, rabbit, and humans .
P2X receptor
AMPA receptor
5-HT receptor
NMDA receptor
Trk receptor
Opioid receptor
Muscarinic acetylcholine receptor
Nicotinic acetylcholine receptor