How immature CD4+CD8+ thymocytes become committed to either the CD4 (helper) or CD8 (cytotoxic) lineage is controversial. Genetic ablation of a silencer element in the gene encoding CD4 provides new evidence that CD8 lineage commitment occurs via a stochastic, rather than instructive, mechanism.
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MacDonald, H., Held, W. CD8+ T cell development: CD4 to the rescue. Nat Immunol 2, 1091–1092 (2001). https://doi.org/10.1038/ni1201-1091
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DOI: https://doi.org/10.1038/ni1201-1091