Compared with that of naive CD8+ T cells, the homeostatic population expansion of naive CD4+ T cells in a lymphopenic environment is limited. New data indicate that this difference is caused by high systemic concentrations of IL-7, which inhibit the function of dendritic cells.
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Kaye, J. Niche marketing: regulation of the homeostasis of naive CD4+ T cells. Nat Immunol 10, 136–138 (2009). https://doi.org/10.1038/ni0209-136
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DOI: https://doi.org/10.1038/ni0209-136