0 -> C_Uninfected_CD4
C_Uninfected_CD4 -> 0
I_Infected_CD4 -> 0
F_CTL -> 0
V_Virus -> 0
C_Uninfected_CD4 -> I_Infected_CD4
I_Infected_CD4 -> 0
0 -> F_CTL
0 -> V_Virus