Purity ~95% (SDS-PAGE, HPLC). Human BAFF (for B cell activating factor belonging to the TNF family) is a newly discovered novel ligand of the TNF family. BAFF plays an important role as co-stimulator of B cell proliferation and function. Source: Recombinant protein corresponding to 153aa residues from human BAFF, fused to his-tag at N-terminal, expressed in E. coli. Molecular Weight: ~19.34kD Biological Activity: Determined by the dose-dependent stimulation of IL-8 production by human PBMC. The ED50 for this effect is <10ng/ml. Please note: results may vary with PBMC donors. Endotoxin: <0.1ng/ug