PDCD1 and infection: We found a significant positive correlation between the total infection frequency and the infection frequency of tat/rev/RRE+ proviruses in PD-1+ cells (r=0.78, 95% CI: 0.45, 0.92, p=0.0006; Supplementary Figure 3B) and DP cells (r=0.56, 95% CI: 0.06, 0.84, p=0.03; Supplementary Figure 3D).