x1 = EGF
x2 = NGF
x3 = freeEGFReceptor
x4 = boundEGFReceptor
x5 = freeNGFReceptor
x6 = boundNGFReceptor
x7 = SosInactive
x8 = SosActive
x9 = P90RskInactive
x10 = P90RskActive
x11 = RasInactive
x12 = RasActive
x13 = RasGapActive
x14 = Raf1Inactive
x15 = Raf1Active
x16 = BRafInactive
x17 = BRafActive
x18 = MekInactive
x19 = MekActive
x20 = ErkInactive
x21 = ErkActive
x22 = PI3KInactive
x23 = PI3KActive
x24 = AktInactive
x25 = AktActive
x26 = C3GInactive
x27 = C3GActive
x28 = Rap1Inactive
x29 = Rap1Active
x30 = RapGapActive
x31 = PP2AActive
x32 = Raf1PPtase