0 -> x_Tumor_Cells
x_Tumor_Cells -> 0
x_Tumor_Cells -> 0
0 -> y_CD4_T_Cells
y_CD4_T_Cells -> 0
y_CD4_T_Cells -> 0
0 -> y_CD4_T_Cells
0 -> z_Cytokine
z_Cytokine -> 0
0 -> z_Cytokine
0 -> w_Healthy_Tissue
w_Healthy_Tissue -> 0