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The main advantages of PET sequencing are its reduced cost by sequencing only short fragments , detection of structural variants in the genome , and increased specificity when aligning back to the genome compared to single tags , which involves only one end of the DNA fragment .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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