The efficiencies of NL4.3, AD8 and 89.6 infection, as measured by their original luciferase activities in parental Hut-78/CCR5 cells, were plotted in Figure 3C, showing that AD8 had the highest rate of infection, ~4~fold and ~50-fold above HIV-1 NL4.3 and 89.6, respectively. Here, CCR5 is linked to infection.