title: Allergen Exposure: When Timing Is Everything.
abstract: It is known that young children exposed to allergens are prone to develop asthma later in life. In this issue of Immunity, de Kleer et al. (2016) identify IL-33 as a key player in the developing lung for sensitization to environmental allergens and airway hyperreactivity.
authors.affiliation: Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Department of Microbiology and Immunology, Weill Cornell Medicine, Cornell University, New York, NY 10021, USA.
authors.forename: Tanel
authors.initials: T
authors.lastname: Mahlakõiv
authors.affiliation: Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Department of Microbiology and Immunology, Weill Cornell Medicine, Cornell University, New York, NY 10021, USA. Electronic address: dartis@med.cornell.edu.
authors.forename: David
authors.initials: D
authors.lastname: Artis
mesh_terms: D000485:Allergens / Q000276:immunology*; D001249:Asthma / Q000276:immunology; D016535:Bronchial Hyperreactivity; D004781:Environmental Exposure; D006801:Humans; D000067596:Interleukin-33; D008168:Lung / Q000276:immunology
chemical_list: D000485:Allergens; D000067596:Interleukin-33