A tumor necrosis factor superfamily member that plays a role in the regulation of B-LYMPHOCYTE survival. It occurs as a membrane-bound protein that is cleaved to release an biologically active soluble form with specificity to TRANSMEMBRANE ACTIVATOR AND CAML INTERACTOR PROTEIN; B-CELL ACTIVATION FACTOR RECEPTOR; and B-CELL MATURATION ANTIGEN.

Synonyms: Antigen, CD257, B-Lymphocyte Activating Factor, B Cell Activating Factor, B Lymphocyte Activating Factor, TNF and APOL Related Leukocyte Expressed Ligand 1, TALL 1 Protein, B Lymphocyte Stimulator, THANK Protein, BLyS Protein, Activating Factor, B-Cell, TNFSF13B Protein, CD257 Antigens, Activating Factor, B-Lymphocyte, 0, CD257 Antigen, Tumor Necrosis Factor Ligand Superfamily Member 13b, B-Cell Activating Factor, TNF Superfamily, Member 13b, TALL-1 Protein, TNF and APOL-Related Leukocyte Expressed Ligand 1, BAFF Ligand, Antigens, CD257