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

────────────────────────────────┬───┬───┬───┬────── OR51F1
                                │   │   │   └────── OR51F2
                                │   │   └────── OR51T1
                                │   └───┬───┬───┬────── OR51Q1
                                │       │   │   └───┬───┬────── OR51A2
                                │       │   │       │   └────── OR51A4
                                │       │   │       └────── OR51A7
                                │       │   └────── OR51L1
                                │       └───┬───┬───┬───┬────── OR51B2
                                │           │   │   │   └────── OR51B4
                                │           │   │   └────── OR51B6
                                │           │   └────── OR51B5
                                │           └────── OR51V1
                                └───┬────── OR51G1
                                    └────── OR51G2