Enhancer I can stimulate the transcription of gene A, but its effect on gene B is blocked by the insulator. 2 Enhancer |l can stimulate the transcription of gene B, but its effect on gene A is blocked by the insulator. Insulator- binding protein Xx- Gene A Promoter Enhancer Insulator Enhancer I Promoter Gene B Transcription start site Transcription start site 17.8 An insulator blocks the action of an enhancer on a promoter when the insulator lies between the enhancer and the promoter.

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A:

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