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Here , we demonstrate that several conserved regions in the 3 ' UTR are potential seed sites for microRNAs ( miRNAs ) , such as miR - 16 , miR - 34c , and miR - 199a .
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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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