Control slides / tissues

Hi folks,

     I am in need of some animal tissue control slides for W.S..  Anyone
know of places that these can be purchased???  The blocks we now have are
getting very low, and we haven't come across any positives we can use as
controls.  I have checked at the Sigma Tissue Trol website and they don't
have W.S. controls..
     Any thoughts or ideas would be appreciated.

Tracy E. Bergeron
Charles River Laboratories
Wilmington, MA

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