21295
Especially , we observed that enhancers , but not the other regulatory elements , dictate cell specificity , as similar cell types share common enhancers , and cell - type - specific enhancers are often bound by transcription factors playing critical roles in that cell type .
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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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