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