I have used this protocol and reagents on formalin fixed tissue with good 
success.

http://www.specialtymedia.com/05Resources/Protocols/Beta%20Gal%20in%20Tissue%20Protocol.htm


Jason D. Burrill
Manager, Histology 
Charles River Laboratories
251 Ballardvale Street
Wilmington, MA 01887
ph:   978-658-6000 ext 1652
fax:  978-988-8793
E-mail:  jason.burrill@crl.com
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