CXCR6 and eosinophilic esophagitis: Murine and human iNKT cells home in the tissue via interaction of receptor CXCR6 and ligand CXCL16;40, 41 therefore, we next examined the source of CXCL16 in the esophageal mucosa by performing rabbit anti-CXCL16 immunofluorescence staining of the esophageal biopsies of comparison control normal subjects and EoE patients.