x1 = Cyclin_D
x2 = Cdk4
x3 = Cyclin_D_Cdk4
x4 = Cyclin_E
x5 = E2F
x6 = Cdk2
x7 = Cyclin_E_Cdk2_inactive_phosphorylated
x8 = Cyclin_A
x9 = B_Myb_active
x10 = Cyclin_A_Cdk2_inactive
x11 = Cyclin_A_Cdk2_active
x12 = APC_Ccdc20_active
x13 = APC_Ccdh1_active
x14 = Cyclin_E_Cdk2_active_unphosphorylated
x15 = p21
x16 = p21_CyclinD_Cdk4
x17 = p27
x18 = p27_CyclinD_Cdk4
x19 = Cdc25A_active
x20 = p27_CyclinE_Cdk2
x21 = p21_CyclinE_Cdk2
x22 = p27_CyclinA_Cdk2
x23 = p21_CyclinA_Cdk2
x24 = p53
x25 = p16
x26 = Rb
x27 = Rb_E2F
x28 = Rb_PP_E2F
x29 = Rb_PPP
x30 = ATM_ATR
x31 = Mdm2
x32 = Intermediate
x33 = sig
x34 = deg
x35 = NF_Y
x36 = Cdc25A_inactive
x37 = Chk1_active
x38 = Chk1_inactive
x39 = Cyclin_B
x40 = Cdk1
x41 = Cyclin_B_Cdk1_inactive_unphosphorylated_cytoplasm
x42 = Cyclin_B_Cdk1_active_phosphorylated_cytoplasm
x43 = Cdc25C_active
x44 = _14_3_3_sigma
x45 = Cdc25C_Ps216_phosphorylated_active
x46 = Wee1
x47 = Wee1_phosphorylated
x48 = Cyclin_B_Cdk1_nuclear
x49 = p21_CyclinB_Cdk1
x50 = B_Myb_inactive
x51 = Cdc25C_inactive
x52 = Cdc25C_Ps216_phosphorylated_inactive
x53 = _14_3_3_sigma_iCdc25C_PS216_phosphorylated
x54 = APC_Ccdc20_inactive
x55 = APC_Ccdh1_inactive
x56 = Cyclin_B_Cdk1_nuclear_inactive
x57 = Cyclin_E_total
x58 = Cyclin_A_total
x59 = Cyclin_B_total
x60 = APC_C_Cdc20_active_x20