Human CCL26 was identified by analysis of the genomic region containing the gene for CCL24. These two chemokines are localized within a region of ~40 kilobases. CCL26 is an agonist for CCR3 and is an antagonist for CCR1, CCR2, and CCR5. In addition to CCL11, CCL24, and CCL26, other chemokines bind to the CCR3 receptor such as CCL5, CCL8, CCL7, and CCL17. CCL26 is induced by IL-4 and IL-13 in human endothelial cells, and it induces eosinophil transmigration. CCL26 is stored in endothelial cell specific-storage granules (Weibel-Palade bodies) and is released upon secretogenic stimuli. Interestingly, CCL26 binds to CX3CR1 and induces adhesion of CX3CR1-expressing cells to endothelium. CCL26 has been linked to allergic diseases, eosinophil esophagitis and atopic dermatitis. In addition, high level of CCL26 in blood and affected tissues has been associated with Churg-Strauss syndrome, which is characterized by eosinophilia in blood and affected tissues.