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The block of HIV-1 in murine BM cells is not saturable with virus-like particles. Human NP2, rhesus macaque FRhK-4, and mouse BM cells were coinfected with GFP- and puro-expressing HIV-1 vectors. The percentage of infection was measured by analysis of GFP expression 72 h later (cell lines) and 7 days later (BM cells) by FACSA.
