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REACTIVITY SENSITIVITY MW (kDa) Isotype
Rabbit 

Product Usage Information

Storage: Supplied in PBS (pH 7.2), less than 0.1% sodium azide and 2 mg/ml BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze.

Specificity / Sensitivity

ID3 (D16D10) Rabbit mAb (Alexa Fluor® 488 Conjugate) recognizes endogenous levels of total ID3 protein.


Species predicted to react based on 100% sequence homology: Dog

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the carboxy terminus of human ID3 protein.

Product Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 488 fluorescent dye and tested in-house for direct flow cytometry analysis in human cells. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated ID3 (D16D10) Rabbit mAb #9837.


Inhibitor of DNA-binding/Differentiation (ID) proteins are a family of proteins that function to repress the activity of basic helix-loop-helix (bHLH) transcription factors. There are four known ID proteins in humans (ID1-4), all of which contain a helix-loop-helix domain but lack a basic DNA binding domain. Heterodimerization with bHLH transcription factors therefore functions to sequester bHLH proteins and prevent their binding to DNA (1). ID proteins play important functional roles in development, primarily by inhibiting premature differentiation of stem/progenitor cells (1,2). ID3 plays an important role in immune system development where it has been shown to repress E2A-mediated differentiation of T cells (3). Studies in mouse models have shown that homozygous deletion of ID3 disrupts regulatory T cell differentiation (4) and leads to development of γδ T cell lymphoma (5). Outside of the hematopoietic compartment, ID3 was shown to repress MyoD, implicating ID3 in TGFβ-mediated muscle repair (6). Similarly, research studies have shown that ID3 suppresses p21 in colon cancer cells, a function that is purported to promote the self-renewal capacity of putative cancer-initiating cells (7).


1.  Yokota, Y. (2001) Oncogene 20, 8290-8.

2.  Hong, S.H. et al. (2011) J Cell Sci 124, 1445-52.

3.  Miyazaki, M. et al. (2011) Nat Immunol 12, 992-1001.

4.  Maruyama, T. et al. (2011) Nat Immunol 12, 86-95.

5.  Li, J. et al. (2010) Blood 116, 5615-21.

6.  Clever, J.L. et al. (2010) Am J Physiol Cell Physiol 298, C1087-99.

7.  O'Brien, C.A. et al. (2012) Cancer Cell 21, 777-92.


Entrez-Gene Id 3399
Swiss-Prot Acc. Q02535


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
XP is a registered trademark of Cell Signaling Technology, Inc.
The Alexa Fluor dye antibody conjugates in this product are sold under license from Life Technologies Corporation for research use only, except for use in combination with DNA microarrays. The Alexa Fluor® dyes (except for Alexa Fluor® 430 dye) are covered by pending and issued patents. Alexa Fluor® is a registered trademark of Molecular Probes, Inc.

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ID3 (D16D10) Rabbit mAb (Alexa Fluor® 488 Conjugate)