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REACTIVITY SENSITIVITY MW (kDa) Isotype
H Endogenous Rabbit IgG
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Immunofluorescence (Immunocytochemistry)

Confocal immunofluorescent analysis of NTERA-2 cl.D1 (left) and HeLa (right) cells using Sox2 (D6D9) XP® Rabbit mAb (Alexa Fluor® 594 Conjugate) (red). Actin filaments were labeled with Alexa Fluor® 488 phalloidin (green).

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Immunofluorescence (Immunocytochemistry)

A. Solutions and Reagents

NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalently purified water.

  1. 20X Phosphate Buffered Saline (PBS): (9808) To prepare 1L 1X PBS: add 50 ml 20X PBS to 950 ml dH2O, mix. Adjust pH to 8.0.
  2. Formaldehyde: 16%, methanol free, Polysciences, Inc. (cat# 18814), use fresh and store opened vials at 4°C in dark, dilute in 1X PBS for use.
  3. Permeabilization Buffer (1X PBS/0.2% Triton X-100):
    To prepare 25 ml, add 2.5 ml 10X PBS, and 22.5 ml dH2O and mix well. While stirring, add 50 µl Triton X-100.
  4. Image-iT™ FX Signal Enhancer (#11932)
  5. Blocking Buffer (1X PBS / 5% normal serum / 0.3% Triton™ X-100): To prepare 10 ml, add 0.5 ml normal serum from the same species as the secondary antibody (e.g., Normal Goat Serum (#5425)) and 0.5 mL 20X PBS to 9.0 mL dH2O, mix well. While stirring, add 30 µl Triton™ X-100.
  6. Antibody Dilution Buffer (1X PBS / 1% BSA / 0.3% Triton X-100): To prepare 10 ml, add 30 µl Triton™ X-100 to 10 ml 1X PBS. Mix well then add 0.1 g BSA (9998), mix.
  7. Prolong® Gold AntiFade Reagent (#9071), Prolong® Gold AntiFade Reagent with DAPI (#8961).

B. Specimen Preparation - Cultured Cell Lines (IF-IC)

NOTE: Cells should be grown, treated, fixed, and stained directly in multi-well plates, chamber slides, or on coverslips.

  1. Aspirate liquid, then cover cells to a depth of 2–3 mm with 4% formaldehyde in 1X PBS.
    NOTE: Formaldehyde is toxic, use only in fume hood.
  2. Allow cells to fix for 15 minutes at room temperature.
  3. Aspirate fixative, rinse three times in 1X PBS for 5 minutes each.
  4. Proceed with Immunostaining (Section C).

C. Immunostaining

NOTE: All subsequent incubations should be carried out at room temperature unless otherwise noted in a humid light-tight box or covered dish/plate to prevent drying and fluorochrome fading.

  1. Permeabilize the cells in Permeabilization Buffer for 5 minutes at room temperature.
  2. Rinse three times in 1X PBS for 5 minutes each.
  3. Apply 3–4 drops of Image-iT™ FX Signal Enhancer (#11932) and incubate for 30 minutes at room temperature.
  4. Rinse three times with 1X PBS for 5 minutes each.
  5. Block specimen in Blocking Buffer for 60 minutes.
  6. While blocking, prepare primary antibody by diluting as indicated on datasheet in Antibody Dilution Buffer.
  7. Aspirate blocking solution, apply diluted primary antibody.
  8. Incubate overnight at 4°C.
  9. Rinse three times in 1X PBS for 5 minutes each.
  10. Coverslip slides with Prolong® Gold Antifade Reagent (#9071), Prolong® Gold AntiFade Reagent with DAPI (#8961).
  11. For best results, examine specimens immediately using appropriate excitation wavelength. For long-term storage, store slides flat at 4°C protected from light.

posted Februay 2011

protocol id: 6

Product Usage Information

Application Dilutions
Immunofluorescence 1:50

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

Sox2 (D6D9) XP® Rabbit mAb (Alexa Fluor® 594 Conjugate) detects endogenous levels of Sox2 protein.


Species Reactivity: Human
Species predicted to react based on 100% sequence homology: Monkey, Bovine, Dog, Horse

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to amino acids surrounding Gly179 of human Sox2 protein.

Product Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 594 fluorescent dye and tested in-house for direct immunofluorescent analysis in human cells. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated Sox2 (D6D9) XP® Rabbit mAb #3579.


Embryonic stem cells are derived from the inner cell mass of the blastocyst and are unique in their pluripotent capacity and potential for self-renewal. Sox2 is one of a set of transcription factors that are crucial for the maintenance of pluripotency (1). Sox2, Oct-4, and Nanog cooperate in this network (1-3), and siRNA knockdown of either Sox2 or Oct-4 results in loss of pluripotency (4,5). Chromatin immunoprecipitation experiments have shown that Sox2 and Oct-4 bind to thousands of gene regulatory sites, highlighting the importance of these transcription factors in early embryonic development (6,7). It has recently been shown that Sox2 is amplified in lung and esophageal squamous cell tumors (8).


1.  Nichols, J. et al. (1998) Cell 95, 379-391.

2.  Avilion, A.A. et al. (2003) Genes Dev. 17, 126-140.

3.  Boyer, L.A. et al. (2005) Cell 122, 947-56.

4.  Loh, Y.H. et al. (2006) Nat Genet 38, 431-40.

5.  Matin, M.M. et al. (2004) Stem Cells 22, 659-668.

6.  Niwa, H. et al. (2000) Nat. Genet. 24, 372-376.

7.  Bass, A.J. et al. (2009) Nat Genet 41, 1238-42.

8.  Rodda, D.J. et al. (2005) J Biol Chem 280, 24731-7.


Entrez-Gene Id 6657
Swiss-Prot Acc. P48431


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
XP® is a 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.