ICOS Antibody (C398.4A) [Biotin]


Flow Cytometry: ICOS Antibody (ISA-3) [Biotin] [NBP1-43472] - Staining of 2-day unstimulated (left) and 2-day Anti-Human CD3/CD28 and activated (right) PBMC with Mouse IgG1 kappa Isotype Control Biotin (open histogram) ...read more

Product Details

Reactivity Hu, Mu, RtSpecies Glossary
Applications Flow
Armenian Hamster
Please see the vial label for concentration. If unlisted please contact technical services.

ICOS Antibody (C398.4A) [Biotin] Summary

Mouse T cell clone D10.G4.1
CD278 (C398.4A)
Armenian Hamster
Protein A or G purified
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Packaging, Storage & Formulations

Store at 4C. Do not freeze.
Biotin (A=N/A, E=N/A)
Aqueous buffer, may contain carrier protein/stabilizer (proprietary)
0.09% Sodium Azide
Please see the vial label for concentration. If unlisted please contact technical services.
Protein A or G purified


Application Notes
The ISA-3 antibody has been tested by flow cytometric analysis of unstimulated and PHA-activated (2 days) human blood leukocytes. This can be used at less than or equal to 0.5 ug per test. Cell number should be determined empirically but can range from 10^5to 10^8cells/test.
Readout System

Reactivity Notes

May react with Rhesus and Swine

Alternate Names for ICOS Antibody (C398.4A) [Biotin]

  • Activation-inducible lymphocyte immunomediatory molecule
  • AILIMCD278
  • CD278 antigen
  • CD278
  • CRP-1
  • CVID1
  • inducible costimulator
  • inducible T-cell costimulator
  • inducible T-cell co-stimulator
  • MGC39850


The ISA-3 monoclonal antibody reacts with human ICOS (Inducible COStimulatory molecule), also known as H4, CRP-1 and AILIM. ICOS is a T cell specific activation molecule and a third member of the CD28/CTLA-4 family. Human ICOS has a relative molecular mass of 55-60 kDa, composed of 27 kDa and 29 kDa chains. Human ICOS on activated T cells has potent costimulatory activity for T cell activation and is required for humoral immune responses, in particular for memory B cell and plasma cell generation. ICOS binds to its ligand, B7h/B7RP-1 expressed on activated APCs (antigen presenting cells) and on a number of inflamed peripheral tissues. Plate-bound ISA-3 is costimulatory for T cells and induces production of IL-4, IL-5, IL-10 and other cytokines, but not IL-2. ISA-3 has the same reactivity pattern and characteristics as F44. ISA-3 was generated against the human ICOS antigen. C398.4A, anti-mouse ICOS/H4, was shown to cross-react with human ICOS but binds to an epitope different from ISA-3. C398.4A stains activated cells brighter than ISA-3 however, it also exhibits higher staining of non-activated human peripheral blood or isolated PBMC. To achieve the brightest staining of ICOS on activated human T cells, please use or rather than.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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Secondary Antibodies


Isotype Controls

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Contact Information

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Gene Symbol ICOS

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