Figure 3.

Analysis of peripheral blood T_CM and T_EM populations. Memory subsets were defined on CD28 expression within the CD95⁺ T cell population before and after infection under different conditions of replication permissivity. (a) Representative result illustrating the gating strategy based on CD28 expression. Comparison of frequencies of global T_CM and T_EM CD4⁺ (b &c) and CD8⁺ (d &e) T cell populations before and after chronic SIV infection. Statistically significant differences are shown as ρ values determined by paired t-test.