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Ki67 expression in CD4+ T cells after SIVΔnef vaccination. Intracellular Ki67 expression was quantified in CD4+ T cells by flow cytometry in lymphocytes isolated from blood (PBMC), peripheral lymph node biopsies (PLN), and rectal biopsies (RecBx) taken one week prior to and three weeks after SIVΔnef vaccination. Bars indicate medians of six animals; *, P < 0.05; **, P < 0.01; Mann Whitney test.
