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Virus-specific memory CD8 and CD4 T-cell responses. Memory CD8 and CD4 T-cell responses were determined more than 200 days following LCMV (A) or VV (B) infection. Responses were analyzed by intracellular IFN-γ staining after stimulation with virus-infected A-20 cells. The percentages of CD8 and CD4 T cells producing IFN-γ are indicated in the upper right corners of the corresponding panels.
