Table 1 Serotonin 5HT2A receptors and their major signaling pathways
| Subtype | Major signaling pathways |
|---|---|
| 5-HT1A, 5-HT1B,5-HT1D, 5-HT1E, 5-HT1F |  cAMP |
| 5-HT2A, 5-HT2B, 5-HT2C |  IP3 |
| 5-HT3A, 5-HT3B | Ion channel |
| 5-HT4 |  cAMP |
| 5-HT5A, 5-HT5B | cAMP ? |
| 5-HT6 |  cAMP |
| 5-HT7 |  cAMP |