FIG. 2.

Flow cytometry dot plots of CD45RA and L-selectin expression on intestinal lamina propria CD3⁺ CD4⁺ T cells from an uninfected macaque (left), a macaque infected for 14 days (center), and an animal with AIDS (right). Note that the vast majority of intestinal memory (CD45RA⁻) cells are eliminated in early SIV infection, resulting in an increased proportion of naive (CD45RA⁺) cells remaining. Plots were generated by gating first through lymphocytes and then through CD3⁺ CD4⁺ DP T cells (four-color flow cytometry).