IL15 and eosinophilic esophagitis: IL-15 is known as a growth and survival factor for iNKT cells,37, 38, 39 and we recently reported that IL-15 mRNA and protein levels are increased and correlate with esophageal eosinophilia in patients with EoE.27 In order to further explore the relationship of IL-15 and iNKT cells in the pathogenesis of human EoE, we performed immunofluorescence staining on frozen proximal and distal esophageal biopsy sections of normal subjects and EoE patients, using an iNKT cell-specific receptor anti-hVα24Jα18 antibody (eBioscience, San Diego, CA, USA).