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We experimentally tested 13 candidate regulatory variants at 10 platelet QTLs , and found that 10 ( 76 . 9 % ) affected protein binding , suggesting that this is a frequent mechanism by which regulatory variants influence quantitative trait levels .
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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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