Figure 4E shows that latent HIV-1 infection resulted in a ~1.5-fold increase of ULBP2 mRNA levels in ns CD4+ T cells, albeit not statistically significant, whereas the sole exposure to PRO or BRY lead to a strong ULBP2 mRNA upregulation in non-infected cells (by 16- and 10-fold, respectively); moreover, ULBP2 mRNA was further increased (up to 43-folds) when PRO but not BRY was added to latently infected cell cultures. Here, CD4 is linked to HIV-1 infection.