To further investigate the role of PD-1 as a marker for tat/rev/RRE+ proviruses, we utilised the calculated overall proviral infection frequency within each of the cell subsets (Supplementary Figure 2) to look for correlations between the total infection frequency and the infection frequency of tat/rev/RRE+ proviruses in the four cell subsets (Supplementary Figure 3). The gene discussed is PDCD1; the disease is infection.