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  • MABF442 - Anti-CD45R (B220) Antibody (human/mouse), Biotin, clone RA3-6B2

MABF442 Sigma-Aldrich

Anti-CD45R (B220) Antibody (human/mouse), Biotin, clone RA3-6B2

This rat monoclonal antibody Anti-CD45R (B220) (human/mouse), Biotin, clone RA3-6B2 validated for use in western blotting, IP, IHC, Immunofluorescence & Flow Cytometry for the detection of CD45R (B220).

Synonym: Receptor-type tyrosine-protein phosphatase C, Leukocyte common antigen, L-CA, Lymphocyte antigen 5, Ly-5, T200, CD45

  •  eCl@ss 32160702

  •  NACRES NA.41



Related Categories Antibodies, Primary Antibodies More...
packaging   500 µg (MABF442)
application(s)   flow cytometry: suitable
biological source   rat
clone   RA3-6B2, monoclonal
concentration   0.5 mg/mL
isotype   IgG2aκ
shipped in   wet ice
species reactivity   human, mouse
clone   Monoclonal Antibody
gene symbol   Ly-5
conjugate   biotin conjugate
Quality Assurance   The monoclonal antibody was purified from tissue culture supernatant via affinity chromatography. The purified antibody was conjugated under optimal conditions, with unreacted dye removed from the preparation.

Flow Cytometry Analysis: 0.06 µg of this antibody detected CD45R (B220) in one million C57Bl/6 splenocytes.



Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.


Research Category
Inflammation & Immunology

This rat monoclonal antibody Anti-CD45R (B220) (human/mouse), Biotin, clone RA3-6B2 validated for use in western blotting, IP, IHC, Immunofluorescence & Flow Cytometry for the detection of CD45R (B220).

General description

The RA3-6B2 antibody reacts with the human and mouse CD45 isoform known as CD45R, or B220, a protein tyrosine phosphatase of 220 kDa. CD45 is one of the most abundant hematopoietic markers, and is expressed on all leukocytes (the Leukocyte Common Antigen, LCA). Various isoforms are generated and expressed in cell-specific patterns, all critical for leukocyte function. In mouse, the CD45R/B220 isoform is predominantly found on B cells, at varying levels on all stages from pro-B cells to activated B cells, and may also be detected on certain T cell and NK cell subsets. It is of note that B220 is not similarly expressed on human B cells, where it appears to be differentiation-specific and therefore expressed on only some B cell subsets. Other forms of CD45 with restricted cellular expression include CD45RA, CD45RB, CD45RO and several others.The RA3-6B2 antibody is one of the most consistently used leukocyte markers for B cells, T cell subsets and NK cell subsets in human and mouse. This antibody has also been reported as cross-reactive with feline CD45R/B220.


Immunogen information for this antibody is proprietary information.

Physical form

Purified Rat Monoclonal Antibody in buffer containing 10 mM NaH2PO4, 150 mM NaCl, 0.1% gelatin, pH 7.2, and up to 0.1% sodium azide.

Size Exclusion Chromatography

Storage and Stability

It is recommended to store the product undiluted at 2-8°C and protected from prolonged exposure to light. Do not freeze.

Safety & Documentation

Safety Information

Safety Information for this product is unavailable at this time.


Certificate of Analysis

Protocols & Articles
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