26084
MicroRNAs ( miRNAs ) are small non - coding RNAs , which serve as post - transcriptional regulators of gene expression and are involved in a wide variety of cellular processes , including the DNA damage response ( DDR ) .
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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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