Analysis of the distribution of functionally distinct CMV-specific CD4 T cells within CCR7^- and CCR7⁺ memory cell populations. Flow cytometry profiles of the distribution of blood CMV- and HIV-1-specific IL-2-, IFN-γ-, and IL-2/IFN-γ-secreting cells within gated CD4⁺CCR7^- and CD4⁺CCR7⁺ cell populations are shown in representative HIV-negative subjects, LTNPs, and progressors.