6668
Misfolding of the natively alpha - helical prion protein into a beta - sheet rich isoform is related to various human diseases such as Creutzfeldt - Jakob disease and Gerstmann - Str a ussler - Scheinker syndrome .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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