| Nomenclature | GPR18 | GPR55 | GPR119 |
| HGNC, UniProt | GPR18, Q14330 | GPR55, Q9Y2T6 | GPR119, Q8TDV5 |
| Principal transduction | Gi/o 982 | G12/13 989 | Gs 984,987 |
| Rank order of potency | – | – | N-oleoylethanolamide, N-palmitoylethanolamine > SEA (anandamide is ineffective) 987 |
| Endogenous agonists (pKi) | N-arachidonoylglycine 982 | 2-arachidonoylglycerolphosphoinositol (Selective) 986, lysophosphatidylinositol (pEC50 5.5 – 7.3) 978,985,990 | N-palmitoylethanolamine (Selective), SEA (Selective), N-oleoylethanolamide (Selective) (pEC50 5.4 – 6.3) 977,987,990 |
| Selective agonists (pKi) | – | AM251 (pEC50 6.2 – 6.3) 978,980 | AS1269574 (pEC50 5.6) 993, PSN632408 (pEC50 5.3) 987, PSN375963 (pEC50 5.1) 987 |
| Comment | The pairing of N-arachidonoylglycine with GPR18 was not replicated in two studies based on β-arrestin assays 990,992 | – | – |
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