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The three R5-AIDS viruses did not cause thymocyte depletion soon after inoculation. Thy/Liv cells isolated from representative implants 17 days postinoculation were analyzed by flow cytometry for surface expression of CD4 and CD8. The percentage of thymocytes expressing CD4 and CD8 is indicated in each plot. Uninfected Thy/Liv implants typically contain 80 to 90% CD4+ CD8+ thymocytes.
