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CD4+ T cell cycling and exhaustion. (A) Representative dot plots display the gating strategy used to assess the percentages of intracellular ki67 and surface PD1 expression on CD4+ T cells. The median frequencies of ki67+ CD4+ T cells (B) and memory CD4+ T cells (C). The median frequencies of PD1+ CD4+ T cells (D) and memory CD4+ T cells (E).
