Interleukin 17D (IL-17D) is a 20.2 kDa member of IL-17 family with 185 amino acid residues. IL-17D is expressed by skeletal muscle, brain, adipose tissue, heart, lung, pancreas and secreted to blood. IL-17D can stimulate the production of cytokines such as IL-6, IL-8, GM-CSF, and stimulate local infiltration and proliferation of leukocytes.