preservation of connexin43

I was wondering if anyone knew how long connexin43 is preserved in
paraffin-embedded tissues.  I am just learning immunohistochemistry and am
working with old tissues (about 10 years old) and I am not getting any results. 
Could it be that the antigen has simply not been preserved?
Patience Sutton
University of Western Ontario
Department of Physiology and Pharmacology
Master's Candidate

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