TSLP and airway hyperresponsiveness: After activated by IL‐25, IL‐33 and thymic stromal lymphopoietin (TSLP), ILC2s proliferate and produce amounts of IL‐5, IL‐9 and IL‐13, which in turn enhance airway inflammation, airway remodelling and airway hyperresponsiveness (AHR).26, 57, 58, 59