Robert K. Maeda and François Karch are in the Department of Zoology and Animal Biology, University of Geneva, Geneva, Switzerland. francois.karch@zoo.unige.ch
Breaking the bond between an enhancer and a promoter has serious biological consequences. A recent study describes a new chromatin insulator in the Drosophila melanogaster Antennapedia complex (ANTC) that may ensure that nearby enhancers remain faithful to their respective promoters.
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