x1 = AC_active_cyto_mem
x2 = G_GDP_cyto
x3 = G_protein_cyto
x4 = G_a_s_cyto
x5 = GRK_bg_cyto
x6 = iso_BAR_p_cyto_mem
x7 = PDE4_cyto
x8 = ATP_cyto
x9 = AC_PKA_cyto_mem
x10 = R2C2_cyto
x11 = PP_PDE_cyto
x12 = BAR_cyto_mem
x13 = BAR_G_cyto_mem
x14 = iso_extra
x15 = iso_BAR_cyto_mem
x16 = MAPK_active_cyto
x17 = MEK_cyto
x18 = MEK_active_cyto
x19 = B_Raf_active_cyto
x20 = bg_cyto
x21 = B_Raf_cyto
x22 = PKA_cyto
x23 = AC_cyto_mem
x24 = AMP_cyto
x25 = GRK_cyto
x26 = PP2A_cyto
x27 = MAPK_cyto
x28 = PTP_cyto
x29 = PTP_PKA_cyto
x30 = c_R2C2_cyto
x31 = c2_R2C2_cyto
x32 = c3_R2C2_cyto
x33 = iso_BAR_G_cyto_mem
x34 = PDE_high_km_cyto
x35 = cAMP_cyto
x36 = PTP_PP_cyto
x37 = PDE4_P_cyto