IL33 and eosinophilic esophagitis: IL-33 expression is increased in pediatric EoE (Judd et al., 2016) and appears to be expressed by both the endothelium and the basal layer of the epithelium by an undifferentiated, non-dividing esophageal epithelial cell population (Judd et al., 2016; Travers et al., 2016).