Anti-ATP synthase β-chain antibodies block DC-mediated transfer of multiple strains of HIV-1. The indicated HIV-1 strains were all propagated in the Sup-T1 cell line. Data are presented as in Figure 1. All antibodies used in this figure as well as in subsequent figures were at concentrations as specified in “Measuring transfer of HIV-1 to target cells by APCs” and for Figure 1.