| ERK3 | Extracellular signal-regulated kinase 3 |
| MAPK6 | Mitogen-activated protein kinase 6 |
| ERK2 | Extracellular signal-regulated kinase 2 |
| TxY | Threonine–x–tyrosine |
| SEG | Serine–glutamate–glycine |
| SRP | Serine–arginine–proline |
| APE | Alanine–proline–glutamate |
| MAP2K | Mitogen-activated protein kinase kinase |