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

────────────────────────────────────────────────┬───┬───┬───┬────── OR4N2
                                                │   │   │   └────── OR4N4
                                                │   │   └────── OR4N5
                                                │   └───┬────── OR4M1
                                                │       └────── OR4M2
                                                └───┬────── OR4Q2
                                                    └────── OR4Q3