Flow cytometric detection of XIAP in pediatric and adult peripheral blood CD4+ T cells, CD8+ T cells, NK cells, and B cells at 0, 12, and 36 hours after obtaining fresh blood samples. Colored filled histograms represent XIAP expression at 0 hours after blood samples were obtained, maroon unfilled histograms represent XIAP expression at 12 hours after blood samples obtained, and green unfilled histograms represent XIAP expression at 36 hours after blood samples were obtained. Black unfilled histograms represent isotype control antibody staining. 3A was obtained using the 2F1 antibody. 3B was obtained using the clone 48 antibody. Percentages of cells positive for XIAP and the gMCF are given within the histogram boxes.