Dear Bonnie

The article your pathologist is after is possibly:

Miller RT, Kubier P. Blocking endogenous avidin-binding activity in
immunohistochemistry. Appl immunohistochem 1997;5:63-66

You might also have a look at:

Clark P et al. Increased avidin binding due to antigen retrieval:
strategies for indentifying and reducing this widespread phenomenon. J
Cell Path 1998;3,105-112.

Good luck!
--
Jim Elsam
HTEQA Services