Family codes7-a
| Acetylcholine | ACH | Melatonin | MLT |
| Adenosine | ADO | Nerve growth factor | NGF |
| Adenosine and uridine triphosphates | NUCT | Neurokinins | NK |
| Angiotensin | ANG | Neuropeptide Y | NPY |
| Atrial natriuretic peptide | ANP | Neurotrophins | NT1 (etc) |
| Hydroxy leukotrienes | BLT | Neurotensin | NTSN |
| Bradykinin | BK | Neurturin | NTN |
| Calcitonin | CALC | Norepinephrine/epinephrine | ADR |
| Cannabinoids | CBD | Olfactory | OLF |
| Cholecystokinin | CCK | Opioids | OP |
| Calcitonin gene related peptide | CGRP | Oxytocin | OXY |
| Cysteinyl leukotrienes | CLT | Pituitary adenylate cyclase activating peptide | PACAP |
| Ciliary neurotrophic factor | CNTF | Platelet derived growth factor | PDGF |
| Dopamine | DA | Progesterone | PROG |
| Epithelial-derived growth factor | EGF | Prostaglandins | PG |
| Endothelins | ET | Secretin | SEC |
| γ-Aminobutyric acid | GABA | Serotonin (5-hydroxytryptamine) | 5HT |
| Glial-derived nerve factor | GDNF | Somatostatin | SRIF |
| Glutamate | GLU | Transforming growth factor β | TGF |
| Glycine | GLY | Thrombin | THR |
| Growth hormone | GH | Thyroid hormone | TH |
| Gustatory | GUS | Thyrotropin | TSH |
| Histamine | HIST | Vasopressin | VASO |
| Interleukins | IL, IL1 (etc) | Vasoactive intestinal polypeptide | VIP |
| Insulin | INS | Vitamin D3 | VITD3 |
| Inositol 1,4,5-trisphosphate | IP3 |
↵7-a This list is not exhaustive but represents receptor families for which classifications are well developed and a few illustrations of newer receptor families that are not well classified.