Phenotypic characterization of proliferating T cells in different anatomic compartments. Levels of proliferation in naive (CD28⁺CD95⁻) and memory (CD28⁺CD95⁺) CD4⁺ and CD8⁺ T cells isolated from the different anatomic sites in 10 SIV-uninfected SMs and RMs. (A) Percentage of naive and memory CD4⁺ (left graph) and CD8⁺ (right graph) T cells expressing Ki-67 in BM, PB, and LN in 10 SIV-uninfected SMs. (B) Percentage of naive and memory CD4⁺ (left graph) and CD8⁺ (right graph) T cells expressing Ki-67 in BM, PB, and LN in 10 SIV-uninfected RMs. P values are shown when significant differences between groups are present.