The correlation between total infection frequency and the infection frequency of tat/rev/RRE+ proviruses in DN cells approached significance (r=0.5, 95% CI: -0.01, 0.8, p=0.05; Supplementary Figure 3A), while no significant correlation was observed between total infection frequency and the infection frequency of tat/rev/RRE+ proviruses in CTLA-4+ cells (r=0.25, 95% CI: -0.32, 0.68, p=0.37; Supplementary Figure 3C). Here, CTLA4 is linked to infection.