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 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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