25766
Notably , we found that another mechanism of repression by Zap1 , which is encoded in the promoter DNA , likely decreases the size of transcriptional bursts , producing a unique transcriptional state characterized by low expression and low noise .
 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