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

────────────────────────────────────────────────┬───┬───┬───┬───┬────── OR1D4
                                                │   │   │   │   └────── OR1D5
                                                │   │   │   └────── OR1D2
                                                │   │   └───┬────── OR1N1
                                                │   │       └────── OR1N2
                                                │   └───┬────── OR1A1
                                                │       └────── OR1A2
                                                └───┬────── OR1M1
                                                    └───┬────── OR1S1
                                                        └────── OR1S2