1228934 MEK mitogen-activated extracellular signal-regulated kinase 464 3471972 MAPK/ERK mitogen-activated protein kinase/extracellular signal-regulated kinase 269 3795322 MEK/ERK mitogen-activated protein kinase kinase/extracellular signal-regulated kinase 59 2140756 MAPK-ERK mitogen-activated protein kinase-extracellular signal-regulated kinase 19 551626 MEK-ERK mitogen-activated protein kinase/extracellular signal-regulated kinase 8