Receptors

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

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