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Immunohistochemical analysis of paraffin-embedded human lung carcinoma using TCF1 (C63D9) Rabbit mAb #2203 in the presence of control peptide (left) or TCF1 Blocking Peptide (right).

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Product Description

This peptide is used to block TCF1 (C63D9) Rabbit mAb #2203 reactivity in immunohistochemistry protocols.


Quality Control

The quality of the peptide was evaluated by reversed-phase HPLC and by mass spectrometry. The peptide blocks TCF1 (C63D9) Rabbit mAb #2203 by immunohistochemistry.

Product Usage Information

For immunohistochemistry, add twice the volume of peptide as volume of antibody used in 100 µl total volume. Incubate for a minimum of 30 minutes prior to adding the entire volume to the slide. Recommended antibody dilutions can be found on the relevant product data sheet.


Storage: Supplied in 20 mM potassium phosphate (pH 7.0), 50 mM NaCl, 0.1 mM EDTA, 1 mg/ml BSA and 5% glycerol. Store at –20°C.

LEF1 and TCF are members of the high mobility group (HMG) DNA binding protein family of transcription factors that consists of the following: Lymphoid Enhancer Factor 1 (LEF1), T Cell Factor 1 (TCF1), TCF3, and TCF4 (1). LEF1 and TCF1 were originally identified as important factors regulating early lymphoid development (2) and act downstream in Wnt signaling. LEF1 and TCF bind to Wnt response elements to provide docking sites for β-catenin, which translocates to the nucleus to promote the transcription of target genes upon activation of Wnt signaling (3). LEF1 and TCF are dynamically expressed during development and aberrant activation of the Wnt signaling pathway is involved in many types of cancers including colon cancer (4,5).


1.  Waterman, M.L. (2004) Cancer Metastasis Rev 23, 41-52.

2.  Schilham, M.W. and Clevers, H. (1998) Semin Immunol 10, 127-32.

3.  Brantjes, H. et al. (2002) Biol Chem 383, 255-61.

4.  Reya, T. and Clevers, H. (2005) Nature 434, 843-50.

5.  Logan, C.Y. and Nusse, R. (2004) Annu Rev Cell Dev Biol 20, 781-810.


Entrez-Gene Id 6932
Swiss-Prot Acc. P36402


For Research Use Only. Not For Use In Diagnostic Procedures.
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