Inhibition of M-tropic (A) and T-tropic (B) HIV infection of day 5 Mo precursors. Cells were treated or not with a cocktail of MIP-1, MIP-1β, and RANTES or SDF-1, and then inoculated with either BaL or NL4-3 HIV strains, respectively (see Materials and Methods). HIV p24 production was measured for 14 days postinfection (p.i.). Representative results from 1 of 3 independent experiments are shown. (□), BaL; (▪), BaL + MIP-1, MIP-1β, RANTES; (▩), NL4-3; (▨), NL4-3 + SDF-1.