14948
AREAS COVERED : In this review , a potential pitfall in NA - based assays and the progress in the chemical synthesis of all patented NAIs from February 2006 to July 2012 are discussed .
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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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