x1 = TGFb_R1_surface
x2 = TGFb_R2_surface
x3 = TGFb_R1_endo
x4 = TGFb_R2_endo
x5 = TGFb
x6 = TGFb_In
x7 = Active_R2
x8 = Active_Rec
x9 = Active_Rec_endo
x10 = Inactive_Rec
x11 = pS2_c
x12 = S2_c
x13 = S4_c
x14 = pS2_pS2_S4_c
x15 = pS2_pS2_pS2_c
x16 = Smad7mRNA
x17 = S7
x18 = Smad7mRNA1
x19 = pS2_n
x20 = pS2_pS2_S4_n
x21 = pS2_pS2_pS2_n
x22 = S2_n
x23 = S4_n