Additional File 1.

Supplementary figure one. Direct staining of CD4 was avoided due to the reduction of CD4 surface exposure in HIV-1 infected cells, but a control staining for mock infected cells reveals that virtually all CD3⁺/CD8^- cells in this gate were positive for CD4.

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Homann et al. Retrovirology 2009 6:6   doi:10.1186/1742-4690-6-6