Researchers report mad cow breakthrough

U.S. researchers say they have developed cattle that may be biologically incapable of getting mad cow disease, the Washington Post reported.

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<p><a href="http://www.physorg.com/news86886281.html">Researchers report mad cow breakthrough</a></p> <p>U.S. researchers say they have developed cattle that may be biologically incapable of getting mad cow disease, the Washington Post reported. </p>