CTLA4 and infection: In contrast, no significant correlation was observed between total infection frequency and intact nef infection frequency for CTLA-4+ cells (r=0.32, 95% CI: -0.25, 0.72; p=0.25) and DP cells (r=0.23, 95% CI: -0.33, 0.67; p=0.41) (Supplementary Figure 3C, D).