Insulator: cis-regulatory DNA sequence that controls which regions are transcriptionally active
: controls looping and nucleosome modifications for euchromatin
What role do insulator sequences play in the regulation of eukaryotic transcription?
A. They block communication between enhancers and nontargeted promoters
B. They block binding of transcription factors to cis-acting promoter elements
C. They block binding of transcription repressors to cis-acting promoter elements
D. They block binding of transcription factors to enhancers
E. They block binding of transcription factors to silencers
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