0 -> FGFR FGFR -> 0 0 -> MSH MSH -> 0 0 -> C_Raf 0 -> C_Raf C_Raf -> 0 0 -> B_Raf 0 -> B_Raf B_Raf -> 0 0 -> MAPK 0 -> MAPK MAPK -> 0 C_Raf -> C_Raf_inactive C_Raf_inactive -> 0