CSF2 and infection: Macrophages were pre-treated with the anti-A2 antibody (Santa Cruz), or maraviroc (NIH AIDS Research and Reference Reagent Program) for 4 h prior to the addition of HIV-1JR-CSF (MOI = 1), and infection was measured via HIV-1 p24 ELISA (ABL, Kensington, MD, USA) following published procedures [6].