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What Causes Mad Cow Disease?

Credit: Andrew Duffel Wikimedia
article: Prion Cause of Mad Cow Disease? 		Other images from this article
What Causes Mad Cow Disease? Histology Brain Tissue With BSE Proposed Mechanism of Prion Propagation Cow with Mad Cow Disease Global Map of Mad Cow Cases as of 2006
What Causes Mad Cow Disease?, Andrew Duffel Wikimedia