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Replication of different HIV-1 strains in primary macrophages. Seven-day-old macrophages were infected with HIV-1 LAI, HIV-1 NDK, or HIV-1 ADA. At days 2, 6, and 9 after infection, supernatants were collected and assayed for p24 antigen, using an ELISA kit (DuPont). Results are expressed as means ± standard deviations.
