CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Digital illustration showing prions and a brain affected by Creutzfeldt-Jakob disease (CJD), the human form of mad cow disease (bovine spongiform encephalopathy). CJD is caused by a prion which promotes refolding of native proteins into the diseased state. The illustration shows both normal and misfolded proteins.
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