Common Neurotransmitters
| Category | Name | Abbreviation | Metabotropic | Ionotropic |
| Small: Amino acids | Aspartate | - | - | |
| Neuropeptides | N-Acetylaspartylglutamate | NAAG | Metabotropic glutamate receptors; selective agonist of mGluR3 | - |
| Small: Amino acids | Glutamate (glutamic acid) | Glu | Metabotropic glutamate receptor | NMDA receptor, Kainate receptor, AMPA receptor |
| Small: Amino acids | Gamma-aminobutyric acid | GABA | GABAB receptor | GABAA, GABAA-ρ receptor |
| Small: Amino acids | Glycine | Gly | - | Glycine receptor |
| Small: Acetylcholine | Acetylcholine | Ach | Muscarinic acetylcholine receptor | Nicotinic acetylcholine receptor |
| Small: Monoamine (Phe/Tyr) | Dopamine | DA | Dopamine receptor | - |
| Small: Monoamine (Phe/Tyr) | Norepinephrine (noradrenaline) | NE | Adrenergic receptor | - |
| Small: Monoamine (Phe/Tyr) | Epinephrine (adrenaline) | Epi | Adrenergic receptor | - |
| Small: Monoamine (Phe/Tyr) | Octopamine | - | - | |
| Small: Monoamine (Phe/Tyr) | Tyramine | - | ||
| Small: Monoamine (Trp) | Serotonin (5-hydroxytryptamine) | 5-HT | Serotonin receptor, all but 5-HT3 | 5-HT3 |
| Small: Monoamine (Trp) | Melatonin | Mel | Melatonin receptor | - |
| Small: Diamine (His) | Histamine | H | Histamine receptor | - |
| PP: Gastrins | Gastrin | - | - | |
| PP: Gastrins | Cholecystokinin | CCK | Cholecystokinin receptor | - |
| PP: Neurohypophyseals | Vasopressin | AVP | Vasopressin receptor | - |
| PP: Neurohypophyseals | Oxytocin | OT | Oxytocin receptor | - |
| PP: Neurohypophyseals | Neurophysin I | - | - | |
| PP: Neurohypophyseals | Neurophysin II | - | - | |
| PP: Neuropeptide Y | Neuropeptide Y | NY | Neuropeptide Y receptor | - |
| PP: Neuropeptide Y | Pancreatic polypeptide | PP | - | - |
| PP: Neuropeptide Y | Peptide YY | PYY | - | - |
| PP: Opioids | Corticotropin (adrenocorticotropic hormone) | ACTH | Corticotropin receptor | - |
| PP: Opioids | Dynorphin | - | - | |
| PP: Opioids | Endorphin | - | - | |
| PP: Opioids | Enkephaline | - | - | |
| PP: Secretins | Secretin | Secretin receptor | - | |
| PP: Secretins | Motilin | Motilin receptor | - | |
| PP: Secretins | Glucagon | Glucagon receptor | - | |
| PP: Secretins | Vasoactive intestinal peptide | VIP | Vasoactive intestinal peptide receptor | - |
| PP: Secretins | Growth hormone-releasing factor | GRF | - | - |
| PP: Somatostatins | Somatostatin | Somatostatin receptor | - | |
| SS: Tachykinins | Neurokinin A | - | - | |
| SS: Tachykinins | Neurokinin B | - | - | |
| SS: Tachykinins | Substance P | - | - | |
| PP: Other | Bombesin | - | - | |
| PP: Other | Gastrin releasing peptide | GRP | - | - |
| Gas | Nitric oxide | NO | Soluble guanylyl cyclase | - |
| Gas | Carbon monoxide | CO | - | Heme bound to potassium channels |
| Other | Anandamide | AEA | Cannabinoid receptor | - |
| Other | Adenosine triphosphate | ATP | P2Y12 | P2X receptor |
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