Receptors

Major nodes: Class I | OR1/3/7 | OR2/13 | OR4 | OR5/8/9 | OR6/10/11 | OR10D/G/S | OR12 | OR14-like | Olfactory TAARs

────────────────────────────────────────────────────────────┬────── OR4L1
                                                            └───┬───┬───┬───┬───┬───┬────── OR4K15
                                                                │   │   │   │   │   └────── OR4K5
                                                                │   │   │   │   └───┬────── OR4K14
                                                                │   │   │   │       └────── OR4K13
                                                                │   │   │   └───┬────── OR4K3
                                                                │   │   │       └────── OR4K2
                                                                │   │   └────── OR4K1
                                                                │   └────── OR4K17
                                                                └───┬───┬───┬───────────┬────── OR4F3
                                                                    │   │   │           └────── OR4F21
                                                                    │   │   └────── OR4F15
                                                                    │   └────── OR4F6
                                                                    └───┬───┬────── OR4F4
                                                                        │   └────── OR4F17
                                                                        └────── OR4F5