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CD257 / BAFF / TNFSF13B Antibody [C257/1638]

In Stock
Catalog Number Formulation Size Price
Purified Ab with BSA and Azide at 200ug/ml
Purified Ab with BSA and Azide at 200ug/ml
Purified Ab WITHOUT BSA at 1.0mg/ml
Flat Rate Domestic: $60 | Orders outside the US - Contact Us for Order Information | Ships next business day


BAFF/CD257 is a type II transmembrane protein, and a member of the tumor necrosis factor ligand superfamily. It is proteolytically cleaved to form a soluble protein. BAFF, like other TNF ligand family members, forms homo-trimers. The predicted molecular weight of a BAFF monomer is approximately 31kDa. It is expressed on peripheral blood B and T lymphocytes, monocytes, macrophages, and dendritic cells and is upregulated by IFN- BAFF prevents apoptosis and promotes B cell survival by binding the BAFF-specific receptor (BAFFR/BR3).

Product Properties & Targets

Antibody Type
Species Reactivity
Isotype / Light Chain
IgG1 / Kappa
Cellular Localization
Cell membrane, Secreted
Gene Name
Positive Control
Jurkat cells. Tonsil and lymph node.
Purified recombinant human CD257 protein
Alternate Names
Tumor necrosis factor ligand superfamily member 13B, B lymphocyte stimulator, B-cell-activating factor, BAFF, Dendritic cell-derived TNF-like molecule, TNF- and APOL-related leukocyte expressed ligand 1, ApoL related ligand TALL 1; B lymphocyte stimulator; B-cell-activating factor; BAFF; BLyS; CD257; Dendritic cell-derived TNF-like molecule; DTL; PRO738; TALL-1; THANK; TNFSF13B; TNFSF20; Tumor necrosis factor ligand superfamily member 13b; Tumor necrosis factor ligand superfamily member 20; ZTNF4

Database Links

Entrez Gene ID

Additional Information

Chromosome Location
Mol. Weight of Antigen
31kDa (Monomer)


  • Cytokine that binds to TNFRSF13B/TACI and TNFRSF17/BCMA. TNFSF13/APRIL binds to the same 2 receptors. Together, they form a 2 ligands -2 receptors pathway involved in the stimulation of B- and T-cell function and the regulation of humoral immunity. A third B-cell specific BAFF-receptor (BAFFR/BR3) promotes the survival of mature B-cells and the B-cell response.
  • Isoform 2 seems to inhibit isoform 1 secretion and bioactivity.
  • Acts as a transcription factor for its own parent gene, in association with NF-kappa-B p50 subunit, at least in autoimmune and proliferative B-cell diseases. The presence of Delta4BAFF is essential for soluble BAFF release by IFNG/IFN-gamma-stimulated monocytes and for B-cell survival. It can directly or indirectly regulate the differential expression of a large number of genes involved in the innate immune response and the regulation of apoptosis.

Key References

  • Schneider P, et al. 1999. J. Exp. Med. 189:1747.
  • Moore PA, et al. 1999. Science 285:260.

Storage & Stability

Antibody with azide - store at 2 to 8°C. Antibody without azide - store at -20 to -80°C. Antibody is stable for 24 months. Non-hazardous. No MSDS required.


This antibody is available for research use only and is not approved for use in diagnosis.

Supplied as

200ug/ml of Ab Purified from rabbit anti-serum by Protein A. Prepared in 10mM PBS with 0.05% BSA & 0.05% azide. Also available WITHOUT BSA at 1.0mg/ml.


There are no warranties, expressed or implied, which extend beyond this description. Company is not liable for any personal injury or economic loss resulting from this product.


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