Receptors

Major nodes: Class I | OR1/3/7 | OR2/13 | OR4 | OR5/8/9 | OR6/10/11 | OR10D/G/S | OR12 | OR14-like | Olfactory TAARs

────────────────────────────────────────────┬───┬────── OR2A4
                                            │   └───┬────── OR2A7
                                            │       └────── OR2A25
                                            └───┬───┬───┬────── OR2A1
                                                │   │   └────── OR2AT4
                                                │   └───┬───┬────── OR2A5
                                                │       │   └────── OR2A14
                                                │       └────── OR2A12
                                                └────── OR2A2