2558
The ability of small interfering RNAs ( siRNAs ) to potently but reversibly silence genes in vivo has made them particularly well suited as a new class of drugs that interfere with disease - causing or disease - promoting genes .
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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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