Anti-CD81 antibody [1D6] - Low Endotoxin (ab35026)


  • Product name
    Anti-CD81 antibody [1D6] - Low Endotoxin
    See all CD81 primary antibodies
  • Description
    Mouse monoclonal [1D6] to CD81 - Low Endotoxin
  • Host species
  • Specificity
    ab35026 recognises CD81, a 26kD cell surface antigen and a member of the tetraspanin family.
  • Tested applications
    Suitable for: Flow Cyt, IHC-P, IP, WB, Functional Studies, ICC/IFmore details
  • Species reactivity
    Reacts with: Human, Chimpanzee
  • Immunogen

    Tissue, cells or virus corresponding to Human CD81. Aggregated OCI-LY8 cells.

  • Positive control
    • Flow Cyt: HAP1-WT cells.
  • General notes

    Ab35026 is a potent CD81 reagent, induces homotypic adhesion and has powerful anti proliferative effects. Endotoxin Level: <0.01 Eu/ug (low endotoxin grade).


  • Form
  • Storage instructions
    Shipped at 4°C. Upon delivery aliquot and store at -20°C. Avoid freeze / thaw cycles.
  • Storage buffer
    Preservative: None
    Constituents: PBS, pH 7.4
  • Concentration information loading...
  • Purity
    Protein G purified
  • Purification notes
    This antibody was purified from tissue culture supernatant.
  • Primary antibody notes
    Ab35026 is a potent CD81 reagent, induces homotypic adhesion and has powerful anti proliferative effects. Endotoxin Level: <0.01 Eu/ug (low endotoxin grade).
  • Clonality
  • Clone number
  • Myeloma
  • Isotype
  • Research areas


Our Abpromise guarantee covers the use of ab35026 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
Flow Cyt 1/10.

Use 10µl of the suggested working dilution to label 106 cells in 100µl.
ab170190 - Mouse monoclonal IgG1, is suitable for use as an isotype control with this antibody.

IHC-P Use at an assay dependent concentration.
IP Use at an assay dependent concentration.
WB Use at an assay dependent concentration. Use under non reducing condition. Predicted molecular weight: 26 kDa.


Functional Studies Use at an assay dependent concentration.
ICC/IF Use at an assay dependent concentration.


  • Function
    May play an important role in the regulation of lymphoma cell growth. Interacts with a 16-kDa Leu-13 protein to form a complex possibly involved in signal transduction. May acts a the viral receptor for HCV.
  • Tissue specificity
    Hematolymphoid, neuroectodermal and mesenchymal tumor cell lines.
  • Involvement in disease
    Defects in CD81 are the cause of immunodeficiency common variable type 6 (CVID6) [MIM:613496]; also called antibody deficiency due to CD81 defect. CVID6 is a primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B cells is usually in the normal range, but can be low.
  • Sequence similarities
    Belongs to the tetraspanin (TM4SF) family.
  • Post-translational
    Not glycosylated.
  • Cellular localization
  • Information by UniProt
  • Database links
  • Alternative names
    • 26 kDa cell surface protein TAPA 1 antibody
    • 26 kDa cell surface protein TAPA-1 antibody
    • 26 kDa cell surface protein TAPA1 antibody
    • CD 81 antibody
    • CD81 antibody
    • CD81 antigen (target of antiproliferative antibody 1) antibody
    • CD81 antigen antibody
    • CD81 molecule antibody
    • CD81_HUMAN antibody
    • CVID6 antibody
    • S5.7 antibody
    • TAPA 1 antibody
    • TAPA1 antibody
    • Target of the antiproliferative antibody 1 antibody
    • Tetraspanin 28 antibody
    • Tetraspanin-28 antibody
    • Tetraspanin28 antibody
    • Tspan 28 antibody
    • Tspan-28 antibody
    • Tspan28 antibody
    see all


  • Overlay histogram showing HAP1 wildtype (green line) and HAP1-CD81 knockout cells (red line) stained with ab35026. The cells were fixed with 4% formaldehyde (10 min)  and then permeabilized with 0.1% PBS-Triton X-100 for 15 min. The cells were then incubated in 1x PBS / 10% normal goat serum to block non-specific protein-protein interactions followed by the antibody (ab35026, 0.1µg/ml) for 30 min at 22°C. The secondary antibody used was Alexa Fluor® 488 goat anti-mouse IgG (H&L) presorbed (ab150117) at 1/2000 dilution for 30 min at 22°C.

    A mouse IgG1 isotype control antibody  (ab170190) was used at the same concentration and conditions as the primary antibody (HAP1 wildtype - black line, HAP1-CD81  knockout - grey line). Unlabelled sample was also used as a control (this line is not shown for the purpose of simplicity).

    Acquisition of >5,000 events were collected using a 50 mW Blue laser (488nm) and 530/30 bandpass filter.

    This antibody can also be used in HAP1 cells fixed with 80% methanol (5 min), permeabilized with 0.1% PBS-Triton X-100 for 15 min under the same conditions.

  • ab35026 staining CD81 in SH-SY5Y were transfected with cDNA encoding CD81 by ICC/IF (Immunocytochemistry/immunofluorescence). Cells were fixed with paraformaldehyde, permeabilized with 0.2% Triton X-100 in PBS and blocked with 3% BSA for 2 hours at room temperature. Samples were incubated with primary antibody (1/100 in PBS + 3% BSA) for 2 hours. An Alexa Fluor® 488-conjugated goat anti-mouse IgG polyclonal (1/300) was used as the secondary antibody.

    See Abreview

  • Flow cytometry analysis of Human peripheral blood lymphocytes, staining CD81 with ab35026 at 1/10 dilution.


This product has been referenced in:
  • Drummond HA  et al. Renal inflammation and elevated blood pressure in a mouse model of reduced {beta}-ENaC. Am J Physiol Renal Physiol 301:F443-9 (2011). WB ; Mouse . Read more (PubMed: 21543417) »

See 1 Publication for this product

Customer reviews and Q&As

Immunocytochemistry/ Immunofluorescence
Human Cell (SH-SY5Y were transfected with cDNA encoding CD81)
Yes - 0,2% Triton PBS
SH-SY5Y were transfected with cDNA encoding CD81
Blocking step
BSA as blocking agent for 2 hour(s) and 0 minute(s) · Concentration: 3% · Temperature: RT°C

Abcam user community

Verified customer

Submitted Jul 29 2015

Thank you for contacting us today in regards to the Anti-TAPA1 antibody [1D6] - Azide free (ab35026).

As discussed over the phone, I have checked into whether the antibody has been used in ICC. I can confirm that the antibody has been used in ...

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