TNFSF13B, BAFF, BLYS, TALL1, TNFSF20, ZTNF4, Tumor necrosis factor ligand superfamily member 13B, B lymphocyte stimulator, B-cell-activating factor, Dendritic cell-derived TNF-like molecule, TNF- and APOL-related leukocyte expressed ligand 1, CD257, Tumor necrosis factor ligand superfamily member 13b, membrane form, Tumor necrosis factor ligand superfamily member 13b, soluble form

The protein encoded by this gene is a cytokine that belongs to the tumor necrosis factor (TNF) ligand family. This cytokine is a ligand for receptors TNFRSF13B/TACI, TNFRSF17/BCMA, and TNFRSF13C/BAFFR. 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.