Description_x000D_ General description_x000D_ IL13 (interleukin 13) is a classic cytokine produced by Th2 (T-helper) cells. It was originally identified as an inflammatory cytokine production-inhibiting T-cell derived cytokine. Recombinant rat IL-13 is an 11.9 kDa protein containing 109 amino acid residues._x000D_ Biochem/physiol Actions_x000D_ IL13 (interleukin 13) is up-regulated during parasitic infections, and participates in host’s protective immunity against Schistosoma japonicum. This protein promotes eosinophil activation resulting in elevated specific IgE against adult and larval antigens. During acute infection it promotes egg expulsion through increased intestinal contractility. It acts as a liver protective agent where it promotes formation of liver granulomas in a CD4+ T cell-mediated manner, which results in liver fibrosis. In airway disorders, such as asthma, chronic obstructive pulmonary disease (COPD), and cystic fibrosis lung disease, IL13 promotes the formation of airway goblet cells, resulting in excess mucus secretion, which in turn, is regulated by IL13-activated autophagy._x000D_ Physical form_x000D_ Sterile filtered and lyophilized with no additives._x000D_ Reconstitution_x000D_ Centrifuge the vial prior to opening. Avoid freeze-thaw cycles._x000D_ Reconstitute in water to a concentration of 0.1-1.0 mg/mL. The solution can be diluted into other aqueous buffers.