Receptors

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

────────────────────────────────────────────────────┬───┬───┬────── OR4D5
                                                    │   │   └───┬────── OR4Q2
                                                    │   │       └────── OR4Q3
                                                    │   └───┬───┬───┬───┬────── OR4D11
                                                    │       │   │   │   └────── OR4D10
                                                    │       │   │   └────── OR4D9
                                                    │       │   └────── OR4D6
                                                    │       └───┬────── OR4D1
                                                    │           └────── OR4D2
                                                    └───┬───┬───┬────── OR4N4
                                                        │   │   └────── OR4N2
                                                        │   └────── OR4N5
                                                        └───┬────── OR4M1
                                                            └────── OR4M2