CCR5 and infection: As a control, GPI-FluIgG03/GFP-transduced CEMss-CCR5 cells showed 3.93%, 33.7%, and 76.6% p24- and GFP-double positive cells after NL4-3 challenge for 5, 7, and 9 days, respectively, and 2.19%, 7.11%, 31.9%, and 61.3% p24- and GFP-double positive cells after SG3.1 challenge for 5, 7, 9, 11 days, respectively (Figure 4(A,B), upper panels), indicating augmented infections over time; however, the CEMss-CCR5 cells expressing GPI-10E8/GFP had no or very minor (<0.409%) proportions of p24- and GFP-double positive cells during the observation (Figure 4(A,B), lower panels).