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Interleukin 25 (IL-25), also known as IL-17E, is a newly discovered member of the IL-17 cytokine family, but is only 16% homologous to IL-17A in amino acid sequence. IL-25 is mainly derived from mast cells, eosinophils and basophils stimulated by stem cell factors. In addition, intestinal epithelial cells and brain microvascular endothelial cells can also secrete IL-25. IL-25 can induce the differentiation of non-T cells, non-B cells, and hematopoietic stem cells (C-kit), thereby initiating an immune response and expelling intestinal parasites. IL-25 can characteristically induce eosinophil infiltration, activate Th2 cell response, and up-regulate the expression level of IL-4, IL-5, IL-13 and other cytokines. The production of these cytokines is also related to increase of serum IgE, IgGl, IgA level and the infiltration of eosinophils in various tissues.