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From the blood samples , DNA was extracted and used for real - time PCR typing of 2 MT1A single nucleotide polymorphisms ( SNPs ) : rs11640851 and rs8052394 on exons 2 and 3 .
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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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