CCL11 and pulmonary fibrosis: Eotaxin (CCL11) is a chemotactic cytokine produced by epithelial cells, endothelial cells, fibroblasts, and monocytes [21] and has previously been reported to be associated with eosinophil-associated gastrointestinal diseases, allergic asthma, pulmonary fibrosis and atherosclerosis [22,23,24,25,26].