• Product nameAnti-CD21 antibody [1F8]
    See all CD21 primary antibodies
  • Description
    Mouse monoclonal [1F8] to CD21
  • SpecificityThis antibody reacts with CD21 antigen of MW 145 kDa, present on the surface of mature B cells. The antigen is present at high density on follicular dendritic cells. CD21 is involved in transmitting growth promoting signals to the interior of the B cell.
  • Tested applicationsSuitable for: IHC-P, IHC-Frmore details
  • Species reactivity
    Reacts with: Human
  • Immunogen

    Purified receptor for the C3d fragment of the third complement component CR2.

  • Positive control
    • Tonsil.


  • FormLiquid
  • Storage instructionsShipped at 4°C. Store at +4°C short term (1-2 weeks). Store at -20°C or -80°C. Avoid freeze / thaw cycle.
  • PurityTissue culture supernatant
  • ClonalityMonoclonal
  • Clone number1F8
  • Myelomaunknown
  • IsotypeIgG1
  • Light chain typekappa
  • Research areas


Our Abpromise guarantee covers the use of ab9492 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
IHC-P 1/10 - 1/25. Incubate for 30-60 minutes at room temperature.
IHC-Fr Use at an assay dependent concentration.


  • FunctionReceptor for complement C3Dd, for the Epstein-Barr virus on human B-cells and T-cells and for HNRPU. Participates in B lymphocytes activation.
  • Tissue specificityMature B-lymphocytes, T-lymphocytes, pharyngeal epithelial cells, astrocytes and follicular dendritic cells of the spleen.
  • Involvement in diseaseGenetic variations in CR2 are associated with susceptibility to systemic lupus erythematosus type 9 (SLEB9) [MIM:610927]. Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with a complex genetic basis. SLE is an inflammatory, and often febrile multisystemic disorder of connective tissue characterized principally by involvement of the skin, joints, kidneys, and serosal membranes. It is thought to represent a failure of the regulatory mechanisms of the autoimmune system.
  • Sequence similaritiesBelongs to the receptors of complement activation (RCA) family.
    Contains 15 Sushi (CCP/SCR) domains.
  • Cellular localizationMembrane.
  • Information by UniProt
  • Database links
  • Alternative names
    • C3DR antibody
    • CD 21 antibody
    • CD21 antibody
    • Complement C3d receptor 2 antibody
    • Complement C3d receptor antibody
    • Complement component (3d/Epstein Barr virus) receptor 2 antibody
    • Complement receptor type 2 antibody
    • CR antibody
    • Cr2 antibody
    • CR2_HUMAN antibody
    • CVID7 antibody
    • EBV receptor antibody
    • EBV-R antibody
    • Epstein Barr virus receptor antibody
    • Epstein-Barr virus receptor antibody
    • EVBR antibody
    • SLEB9 antibody
    see all

Anti-CD21 antibody [1F8] images

  • ab9492 staining human tonsil by IHC-P

References for Anti-CD21 antibody [1F8] (ab9492)

This product has been referenced in:
  • Gallo A  et al. Targeting the Ca(2+) Sensor STIM1 by Exosomal Transfer of Ebv-miR-BART13-3p is Associated with Sjögren's Syndrome. EBioMedicine 10:216-26 (2016). ICC/IF ; Human . Read more (PubMed: 27381477) »

See 1 Publication for this product

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I am sorry this product did not perform as stated on the datasheet and for the inconvenience this has caused. As requested, I have issued a free of charge replacement for one vial of ab75985. To check the status of the order please contact our Customer...

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