Intracellular cytokine responses to CMV lysate and comparison with responses to HIV-1 Gag peptide pool. Flow cytometry histograms, gated on CD3⁺CD4⁺CD8^– T cells, show the phenotype of IFN-γ⁺ cells: (A) Bcl-2 and CD38; (B) Ki-67 and TIA-1; and (C) CD127 (IL-7R) and CD57. Subpopulations in quadrants are shown as percentages of CD3⁺CD4⁺CD8^– cells. Histograms shown are representative of results from 6 different subjects, all showing similar results. Results from all patients and controls are summarized in panels D-E. Bars represent means ± SE for each group of patients.