x1 = Gsbg_cell
x2 = L_cell
x3 = Gsa_gdp_cell
x4 = Gsa_gtp_cell
x5 = b1AR_S464_cell
x6 = PDEcAMP_cell
x7 = PDE_cell
x8 = ATP_cell
x9 = b1AR_cell
x10 = Gs_cell
x11 = A2RC_cell
x12 = A2R_cell
x13 = PKAC_cell
x14 = ARC_cell
x15 = PKAC_AKAR_cell
x16 = Propranolol_cell
x17 = b1ARinhib_cell
x18 = light_spot_cell
x19 = AC_cell
x20 = PKI_cell
x21 = PKAC_PKI_cell
x22 = RC_cell
x23 = b1AR_Gs_cell
x24 = cAMP_cell
x25 = GsAC_cell
x26 = IBMX_cell
x27 = PDE_IBMX_cell
x28 = Fsk_cell
x29 = FskAC_cell
x30 = b1AR_p_cell
x31 = L_b1AR_cell
x32 = AKAR_cell
x33 = AKARp_cell
x34 = PP_cell
x35 = PP_AKARp_cell
x36 = DMNB_cAMP_cell
x37 = L_b1AR_Gs_cell