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TNFSF13B, also named as BAFF, BLYS, TALL1, TNFSF20, ZTNF4 and CD257, is a cytokine that binds to TNFRSF13B/TACI and TNFRSF17/BCMA. This cytokine 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. This antibody recognizes all the forms of TNFSF13B such as soluble form (17 kDa), membrane form (32-35 kDa) and glycosylation form (45-52 kDa).