CCR5 and infection: CCR5 coreceptor expressing CEM.SS.R5.NKr T lymphocyte cells were infected with 1 x 106 infectious units (IUs) of BG505.GFP and BG505.GFP* T/F reporter virus, and the levels of GFP and p24 expression were measured by p24 intracellular flow cytometry at 4, 8, 18, and 24 hours post-infection.