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Age matters in allergy
Development of allergy is driven by type 2 cytokines, IL-4, IL-5, and IL-13. With the discovery that type 2 innate lymphoid cells (ILC2s) and T cells can produce these cytokines, understanding the contributions of T cells and ILC2s in allergic responses has become important. Using mouse models of allergic airway inflammation, Saglani et al. report the contributions of T cells and ILC2s to be dependent on age. They found T cells to be the predominant source of IL-13 in neonatal mice as compared with ILC2s in adult mice. Given that neonates have fewer T cells as compared with adults, the results are contrary to expectations and bring to the fore an unappreciated role of neonatal T cells in this context.
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