Anybody else having problems with PIN 4 staining (Biocare)? We are getting 
brown background staining, even on the glass itself where there is no tissue. 
After many years of fantastic results, this problem has occurred recently. Our 
AMACR is also a lot fainter than it used to be. We've switched out all lots of 
reagents involved, even bought distilled water. Still no movement towards 
solving this problem. Any ideas? 
Jeff Jurczak 
Uropartners Laboratory 
Westchester, IL 
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