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Flexible tail of the prion protein poisons brain cells

Prion proteins are the infectious pathogens that cause Mad Cow Disease and Creutzfeldt-Jakob disease. They occur when a normal prion protein becomes deformed and clumped. The naturally occurring prion protein is harmless and can be found in most organisms. In humans, it is found in our brain cell membrane. By contrast, the abnormally deformed prion protein is poisonous for the brain cells. Scientists have now discovered that the prion protein has a kind of switch that controls its toxicity.
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