U.S. Mad Cow Cases Result From Rare Strain

In the two U.S. cases, researchers did not detect the telltale spongy lesions caused by prions, the misfolded proteins that deposit plaque on the brain and kill brain cells. In addition, the prions in brain tissue samples from the Texas and Alabama cows seemed to be distributed differently from what would be expected to be found in cows with the classic form. Article's URL: http://www.phillyburbs.com/pb-dyn/news/94-06112006-668584.html

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