Does anyone out there have a good reference or list of tissues containing endogenous biotin?  We don't like to put avidin-biotin block on our staining procedures unless the tissue requires it.  We're aware of liver and kidney but there are other tissue types that also contain biotin to a lesser degree.  Thanks for your help.

Linda A. Sebree, HT(ASCP)
University of Wisconsin Hospital & Clinics
IHC/ISH Laboratory
A4/204-2472
600 Highland Ave.
Madison, WI 53792
(608)265-6596
FAX: (608)262-7174