BAFF (B-cell Activation Factor), also known as Tumor Necrosis Factor Superfamily member 13B (TNFSF13B), is expressed in B cell lineage cells and acts as a potent B cell activator. It has been also shown to play an important role in the proliferation and differentiation of B cells. Mouse BAFF Recombinant Protein is purified b-cell activation factor produced in yeast.