TSLP and allergic disease: In recent years, the importance of epithelial‐derived cytokines such as interleukin‐25 (IL‐25), IL‐33 and thymic stromal lymphopoietin (TSLP) in allergy and parasitic infection has become appreciated.7 These cytokines can act directly on DCs, skewing resultant responses to Th2, and also directly activate type 2 innate lymphoid cells (ILC2s), inducing a rapid innate type 2 response.