This set contains class C 'orphan' G protein coupled receptors where the endogenous ligand(s) is not known. (hgnc.genefamily:285)
| Identifier | Name | Relation |
| HGNC:23689 | GPR158 | isa |
| HGNC:20844 | GPR156 | isa |
| HGNC:13309 | GPRC5C | isa |
| HGNC:31371 | GPR179 | isa |
| HGNC:13310 | GPRC5D | isa |
| HGNC:13308 | GPRC5B | isa |
| HGNC:9836 | GPRC5A | isa |
| Relation | Identifier | Name |
| isa | FPLX:GPCR_C | GPCR_C |