518
Additional studies showed that mir - 34a targeted Yin Yang - 1 ( YY1 ) and YY1 is a transcription factor that can stimulate the expression of EGFR .
 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