CD4+ T cells have been classically separated into two dominant effector populations: T helper types 1 and 2. Two new studies suggest that T cells producing interleukin 17 constitute a previously unknown lineage of CD4+ T cells.
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Wynn, T. TH-17: a giant step from TH1 and TH2. Nat Immunol 6, 1069–1070 (2005). https://doi.org/10.1038/ni1105-1069
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DOI: https://doi.org/10.1038/ni1105-1069
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