Human CD21 APC-conjugated Antibody

FAB4909A has been discontinued. View all CD21 products.
Datasheet / CoA / SDS
Product Details
  • Species Reactivity
  • Specificity
    Detects human CD21 in direct ELISAs and Western blots.
  • Source
    Monoclonal Mouse IgG1 Clone # 544408
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    Chinese hamster ovary cell line CHO-derived recombinant human CD21
    Accession # P20023
  • Formulation
    Supplied in a saline solution containing BSA and Sodium Azide.
  • Label
Product Datasheets

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  • Flow Cytometry
    10 µL/106 cells
    See below
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Example
Detection of CD21 in Human PBMCs by Flow Cytometry. Human peripheral blood mononuclear cells (PBMCs) were stained with Mouse Anti-Human CD19 APC‑conjugated Monoclonal Antibody (Catalog # FAB4867A) and either (A) Mouse Anti-Human CD21 PE‑conjugated Monoclonal Antibody (Catalog # FAB4909P) or (B) Mouse IgG1 Phycoerythrin Isotype Control (Catalog # IC002P). View our protocol for Staining Membrane-associated Proteins.
Preparation and Storage
  • Shipping
    The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
  • Stability & Storage
    Protect from light. Do not freeze.
    • 12 months from date of receipt, 2 to 8 °C as supplied.
Background: CD21

CD21, also known as EBV Receptor or CR2 is a 145 kDa member of the RCA (Receptors of Complement Activation) family of proteins. It is expressed on T cells, B cells, and follicular dendritic cells. On the B cell surface, it combines with the BCR and CD19 to form a B cell activating complex. Mature human CD21 is 1013 amino acids (aa) in length. It is a type I Transmembrane (TM) protein that contains a 951 aa Extracellular Domain (ECD) (aa 21-971) and a short 34 aa cytoplasmic tail. The ECD exhibits fifteen 60 aa SUSHI repeats. Soluble CD21 can be generated by cleavage near the TM domain. One potential splice variant shows a deletion of aa 847‑908, while another shows an insertion of 59 aa after Lys659. The ECD of human CD21 shares 71% aa identity with mouse CD21 ECD.

  • Entrez Gene IDs:
    1380 (Human); 12902 (Mouse); 289395 (Rat)
  • Alternate Names:
    C3DR; C3DRSLEB9; CD21 antigen; CD21; Complement C3d receptor; complement component (3d/Epstein Barr virus) receptor 2; complement receptor type 2; CR2; EBV receptor; Epstein-Barr virus receptor
Related Research Areas


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