IL-17F is a member of the IL-17 family, which is comprised of 6 members IL-17A, IL-17B, IL-17C, IL-17D, IL-17E (also called IL-25), and IL-17F. IL-17 family members are involved in numerous immune regulatory functions, including inducing and mediating proinflammatory responses and allergic responses. IL-17 induces the production of many other cytokines (IL-6, G-CSF, GM-CSF, IL-1beta, TGF-beta, and TNF-alpha), chemokines, including IL-8 (CXCL8), GRO-alpha (CXCL1)and MCP-1 (CCL2)and prostaglandins from many cell types (fibroblasts, endothelial cells, epithelial cells, keratinocytes and macrophages).