The transcription factor IRF4 acts as a 'rheostat' for TCR signaling. Discrete levels of IRF4 can activate distinct transcriptional programs in T cells due to binding sites of variable affinity in groups of target genes.
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Gallagher, M., Berg, L. Gene-enhancer variants reveal diverse TCR-mediated differentiation. Nat Immunol 18, 483–484 (2017). https://doi.org/10.1038/ni.3729
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DOI: https://doi.org/10.1038/ni.3729