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From SNPedia

B-cell activating factor (BAFF), also known as tumor necrosis factor ligand superfamily member 13B, is a protein that in humans is encoded by the TNFSF13B gene. 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, and when present in abnormally high amounts, may play a role in SLE.

BAFF is also known as B Lymphocyte Stimulator (BLyS) and TNF- and APOL-related leukocyte expressed ligand (TALL-1) and the Dendritic cell-derived TNF-like molecule (CD257 antigen; cluster of differentiation 257). Wikipedia

BAFF is thought to promote B-cell survival primarily through the BAFF receptor (B-cell activating factor receptor, BAFF-R), also known as tumor necrosis factor receptor superfamily member 13C (TNFRSF13C), which is encoded by the TNFRSF13C gene.Wikipedia