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 ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None