CD21 (Mature B-Cell & Follicular Dendritic Cell Marker) [CR2/3990R]



CD21 also known as complement C3d receptor, Epstein-Barr virus receptor, and complement receptor type 2 (CR2), is a protein that in humans is encoded by the CR2 gene. This protein is involved in the complement system. It binds to iC3b (inactive derivative of C3b), C3dg, or C3d. B cells have CR2 receptors on their surfaces, allowing the complement system to play a role in B-cell activation and maturation.It is expressed by follicular dendritic cells (FDC) and mature B cells, as well as by several types of epithelial cells. CD21 is useful in the identification of follicular dendritic cell matrix found in normal lymph node and tonsillar tissue, and also useful in identifying abnormal.

Product Properties & Targets

Species Reactivity
Cellular Localization
Gene Name
Mol. Weight of Antigen
Synthetic peptide corresponding to CD21 residues within aa933-C terminal of CD21

Database Links

Entrez Gene ID

Additional Information

Human Gene Symbol
Chromosome Location

Known Applications & Suggested Dilutions

  • Immunohistochemistry (Formalin-fixed) (1-2ug/ml for 30 minutes at RT),(Staining of formalin-fixed tissues requires heating tissue sections in 10mM Tris with 1mM EDTA, pH 9.0, for 45 min at 95 &degC followed by cooling at RT for 20 minutes),Optimal dilution for a specific application should be determined.

Key References

  • Barel M, et al. Mol Immunol. 1995 Apr;32(6):389-97.
  • Tanner J, et al. J Virol. 1988 Dec;62(12):4452-64.

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 Bioreactor Concentrate by Protein A/G. Prepared in 10mM PBS with0.05% BSA & 0.05% azide. Also available WITHOUT BSA & azide 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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