Biotin anti-mouse/rat CD81 Antibody

Pricing & Availability
Eat-2 (See other available formats)
Regulatory Status
Other Names
Armenian Hamster IgG1, κ
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Product Citations
C57BL/6 mouse splenocytes stained with Eat-2 PE
  • EAT-2
    C57BL/6 mouse splenocytes stained with Eat-2 PE
  • EAT-2 Rat
    C57BL/6 mouse splenocytes stained with Eat-2 PE
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104903 50 µg 76€
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CD81 is a 26 kD non-glycosylated member of the tetraspanin superfamily (TM4SF), also known as TAPA-1. CD81 is expressed on T and B cells, NK cells, dendritic cells, thymocytes, endothelial cells, and fibroblasts. CD81 induces B cell adhesion via the VLA-4 integrin and has been shown to play a role in early T cell development. CD81 associates with several other cell-surface proteins in a multimolecular complex, including CD19, CD21, CD20, CD37, CD53, and CD82 in B cells, and CD4, CD8 and CD82 in T cells.

Product Details
Technical Data Sheet (pdf)

Product Details

Verified Reactivity
Mouse, Rat
Antibody Type
Host Species
Armenian Hamster
CD81+ mouse B lymphoma 38C13
Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide.
The antibody was purified by affinity chromatography, and conjugated with biotin under optimal conditions.
0.5 mg/ml
Storage & Handling
The antibody solution should be stored undiluted between 2°C and 8°C. Do not freeze.

FC - Quality tested

Recommended Usage

Each lot of this antibody is quality control tested by immunofluorescent staining with flow cytometric analysis. For flow cytometric staining, the suggested use of this reagent is ≤ 0.25 µg per 106 cells in 100 µl volume. It is recommended that the reagent be titrated for optimal performance for each application.

Application Notes

The Eat-2 antibody reacts with mouse and rat CD81. Additional reported applications (for the relevant formats) include: immunoprecipitation1,2, Western blotting1,2, induction of homotypic adhesion of B lymphocytes1, stimulation of B cells undergo early apoptotic events1, and promotion of T cell motility2.

Application References

(PubMed link indicates BioLegend citation)
  1. Maecker HT, et al. 2000. Hybridoma 19:15. (IP, WB, Stim)
  2. Clark KL, et al. 2001. J. Immunol. 167:5115. (IP, WB, Activ)
  3. Bhatnagar S and Schorey JS. 2007. J. Biol. Chem. doi:10.1074/jbc.M702277200. PubMed
  4. Castro-Seoane R, et al. 2012. PLoS Pathog. 8:1002538. PubMed
Product Citations
  1. Lino AC et al. 2018. Immunity. 49(1):120-133 . PubMed
  2. Lindner J, et al. 2013. Mol Cell Biol. 33:4628. PubMed
  3. Hasezaki T, et al. 2020. Sci Rep. 10:6969. PubMed
  4. Sum E, et al. 2022. J Immunother Cancer. 10:. PubMed
  5. , et al. 2021. Eur J Immunol. 51:2708. PubMed
AB_313138 (BioLegend Cat. No. 104903)

Antigen Details

TM4SF tetraspanin, 26 kD

T cells and B cells, NK cells, dendritic cells, thymocytes, endothelial cells, fibroblasts

Regulates cell growth
Cell Type
B cells, Dendritic cells, Endothelial cells, Fibroblasts, NK cells, T cells, Thymocytes
Biology Area
Molecular Family
Adhesion Molecules, CD Molecules
Antigen References

1. Barclay AN, et al. 1997. The Leukocyte Antigen FactsBook Academic Press.
2. Levy S, et al. 1998. Annu. Rev. Immunol. 16:89.
3. Maeker HT, et al. 1997. FASEB J. 11:428.
4. Boismenu R, et al. 1996. Science 271:198.

Gene ID
12520 View all products for this Gene ID 25621 View all products for this Gene ID
View information about CD81 on

Related FAQs

How many biotin molecules are per antibody structure?
We don't routinely measure the number of biotins with our antibody products but the number of biotin molecules range from 3-6 molecules per antibody.
Go To Top Version: 2    Revision Date: 06/14/2022

For research use only. Not for diagnostic use. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


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This data display is provided for general comparisons between formats.
Your actual data may vary due to variations in samples, target cells, instruments and their settings, staining conditions, and other factors.
If you need assistance with selecting the best format contact our expert technical support team.

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  • TotalSeq™-C1064 anti-mouse/rat CD81 Antibody

  • TotalSeq™-A1064 anti-mouse/rat CD81


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