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Levels of PD-1 expression by Mamu-A*01 Tet+CD8+ T cells. Geometric mean fluorescence intensity (gMFI) of PD-1 expression by effector and memory (CD28+CD95+) Mamu-A*01 Tet+CD8+ T cells isolated from blood of NHP # 4327, 4592, and 4607 were analyzed at various time points after immunization. PD-1, programmed death-1.
