x1 = EGFR_active
x2 = D_SOS
x3 = A_SOS
x4 = Raf
x5 = Ras_active
x6 = Mek_active
x7 = ERK
x8 = ERK_active
x9 = IGFR_active
x10 = PI3KCA
x11 = PI3KCA_active
x12 = AKT_active
x13 = AKT
x14 = PP2A
x15 = Ras
x16 = Raf_active
x17 = Mek
x18 = RasGapActive
x19 = RafPP
x20 = P90RskInactive
x21 = P90Rsk_Active