Apoptosis in CD34⁺ BM cells obtained from SIV infected macaques. (A) Representative flow cytometry diagrams for annexin V staining of BM CD34⁺ cells obtained from healthy (left panel) and SIV-infected (right panel) macaques. (B) Representative flow cytometry diagrams of intracellular BcL2 staining of BM CD34⁺ cells obtained from healthy (left panel) and SIV-infected (right panel) macaques. (C) Representative flow cytometry diagrams of intracellular cell cycle analysis (PI staining) of BM CD34⁺ cells obtained from healthy (left panel) and SIV-infected (right panel) macaques. (D) Percentages of cells in G₀/G₁ in healthy macaques (□) or SIV-infected macaques (▪).