Figure 5

Memory T cells. Memory CD4 T cells derived from monkey peripheral blood mononuclear cells (PBMC) were studied before and after SIV challenge. Naive CD4 T cells (Naive), effector memory CD4 T cells (EM) and central memory CD4 T cells (CM) were identified as CD3⁺CD4⁺CD95^–CD28⁺, CD3⁺CD4⁺CD95⁺CD28^– and CD3⁺CD4⁺CD95⁺CD28⁺, respectively. Vac, vaccinated monkey (n=5); Con, control monkey (n=4).