Environmental Research Foundation . . P.O. Box 5036, Annapolis, MD 21403 . .
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To subscribe, E-mail the words . . At this point nvCJD has killed 24 people in Britain and one in France. Mad cow disease is a member of a family of rare diseases called transmissible spongiform encephalopathies, or TSEs. A prion is simply a particular kind of protein. All mammals have prions, and some non-mammalian species have them as well.