CLL24 was initially cloned from a library of activated macrophages, and using human eosinophils, it was shown that it binds to the receptor of eotaxin-1 (CCL11) and MCP-4 (CCL13). In addition, CCL24 shares the CCR3 receptor with CCL26, CCL5, and CCL7. Eotaxin/CCR3 expression has been studied extensively in the pathogenesis of asthma and allergy. In addition, the eotaxin/CCR3 axis has been associated to additional inflammatory and autoimmune disorders including inflammatory bowel disease, multiple sclerosis, eosinophilic esophagitis, and rheumatoid arthritis. CCL24 has also been associated to neovascular age related macular degeneration.