To evaluate it with our EGFP-CEM-NKr-CCR5-SNAP cell line, we persistently infected CEM NKr CCR5 cells with HIV-1 Bal molecular clone, using these cells as donors of replication-competent virus at the peak of the infection, as found by the levels of p24 expression (Fig. 6, Panel C, Donor-0 h). This evidence concerns the gene CCR5 and infection.