CD4+ T cells reportedly program CD8+ T cells to develop into suitable memory cells during the primary immune response. However, new data indicate that the maintenance of CD8+ memory T cells requires continuous exposure to bystander CD4+ T cells.
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Hamilton, S., Prlic, M. & Jameson, S. Environmental conservation: bystander CD4 T cells keep CD8 memories fresh. Nat Immunol 5, 873–874 (2004). https://doi.org/10.1038/ni0904-873
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DOI: https://doi.org/10.1038/ni0904-873
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