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

────────────────────────────────────────────────────┬───┬───┬───┬───┬───┬───┬────── OR2A1
                                                    │   │   │   │   │   │   └───┬───┬────── OR2A4
                                                    │   │   │   │   │   │       │   └────── OR2A7
                                                    │   │   │   │   │   │       └────── OR2A25
                                                    │   │   │   │   │   └────── OR2A5
                                                    │   │   │   │   └────── OR2A12
                                                    │   │   │   └────── OR2A14
                                                    │   │   └────── OR2A2
                                                    │   └───┬────── OR2D2
                                                    │       └────── OR2D3
                                                    └───┬───┬────── OR2F1
                                                        │   └────── OR2F2
                                                        └───┬────── OR2K2
                                                            └────── OR2S2