Receptors

Major nodes: ClassI | OR1/3/7 | OR2/13 | OR2M/T/V | OR4/12 | OR5/8/9 | OR5A/AN | OR6/10/11 | OR10D/G/S | OR14 | OR51/52 | Schiff6

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