x1 = EGF
x2 = HRG
x3 = A1
x4 = A1_2
x5 = A2
x6 = A2_2
x7 = A3
x8 = A3_2
x9 = DUSPmRNA
x10 = ERK_c
x11 = pERK_c
x12 = ppERK_c
x13 = F
x14 = c_FOS_c
x15 = pc_FOS_c
x16 = c_FOSmRNA
x17 = FmRNA
x18 = Kin
x19 = Kin_2
x20 = pMEK
x21 = MEK
x22 = DUSP_c
x23 = pDUSP_c
x24 = RSK_c
x25 = pRSK_c
x26 = RsD
x27 = RsT
x28 = CREB_n
x29 = pCREB_n
x30 = ERK_n
x31 = pERK_n
x32 = ppERK_n
x33 = Elk1_n
x34 = pElk1_n
x35 = FOSn
x36 = FOSn_2
x37 = Fn
x38 = DUSP_n
x39 = pDUSP_n
x40 = pDUSP_n_ERK_n
x41 = pDUSP_n_pERK_n
x42 = pDUSP_n_ppERK_n
x43 = DUSP_n_ERK_n
x44 = DUSP_n_pERK_n
x45 = DUSP_n_ppERK_n
x46 = PreDUSPmRNA
x47 = PreFOSmRNA
x48 = PreFmRNA
x49 = pRSK_n