The Mcp element from the bithorax complex contains an insulator that is capable of pairwise interactions and can facilitate enhancer-promoter communication.

Abstract excerpt

Chromatin insulators, or boundary elements, appear to control eukaryotic gene expression by regulating interactions between enhancers and promoters. Boundaries have been identified in the 3' cis-regulatory region of Abd-B, which is subdivided into a series of separate iab domains. Boundary elements such as Mcp, Fab-7, and Fab-8 and adjacent silencers flank the iab domains and restrict the activity of the iab...

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