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Santa Cruz discontinued a large number of its polyclonal products as a result of the USDA settlement that was made public May 19th 2016

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PhosphoSitePlus® Resource

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Product Description

SignalStain® Citrate Unmasking Solution (10X) is used for antigen unmasking of formalin fixed, paraffin-embedded tissue sections or cell pellets in immunohistochemical assays (IHC-P). Cell Signaling Technology recommends the optimal unmasking reagent for each IHC-P approved antibody. Please consult the primary antibody datasheet to determine if citrate is recommended for your specific product.


Product Usage Information

Dilute to a 1X unmasking solution using ddH2O just before use. Bring slides to a boil in 1X SignalStain® Citrate Unmasking Solution. Maintain at a sub-boiling temperature for 10 min. Cool slides on bench top for 30 min.

Antigen unmasking protocols utilizing a water bath are not recommended. While antigen unmasking performed with a microwave is preferred, the staining of particular tissues or antigen targets may require the use of a pressure cooker.


Storage: Store 10X buffer at 4°C. At 10X, this buffer is stable for 12 months. Always prepare fresh 1X solutions daily.

Proteins within fixed tissue sections contain chemical cross-links that may prevent antibody access or mask antigen targets in immunohistochemical assays. This limited access may vary among different tissue or antigens. Heat-induced antigen unmasking improves accessibility of antibodies to tissues antigens (1).


1.  Yamashita, S. (2007) Prog Histochem Cytochem 41, 141-200.



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

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SignalStain® Citrate Unmasking Solution (10X)