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In this work , we measured the circulating levels of PREP in patients suffering of relapsing remitting ( RR ) , secondary progressive ( SP ) , primary progressive ( PP ) MS , and in subjects with clinically isolated syndrome ( CIS ) .
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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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