Receptors

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

────────────────────────────────────────────────────────────┬───┬───┬───────────┬────── OR4F3
                                                            │   │   │           └────── OR4F21
                                                            │   │   └────── OR4F15
                                                            │   └────── OR4F6
                                                            └───┬───┬────── OR4F4
                                                                │   └────── OR4F17
                                                                └────── OR4F5