Description: Cytokine that binds to TNFRSF5. Mediates B-cell proliferation in the absence of co-stimulus as well as IgE production in the presence of IL-4. Involved in immunoglobulin class switching (By similarity). (www.uniprot.org) Produced in E.coli as a single, non-glycosylated, polypeptide chain containing 149 amino acids.