Purity ~90% (SDS-PAGE). 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. Source: Recombinant protein corresponding to aa113-261 from rabbit CD40 Ligand, fused to His-Tag at N-terminal, expressed in E. coli. Molecular Weight: ~20.2kD AA