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The segment-specific regulatory domains of the  Bithorax  complex (BX-C), which consists of three homeotic genes  Ubx, abd-A  and  Abd-B , are separated by boundaries that function as insulators. Most of the boundaries contain binding sites for the architectural protein CTCF, which is conserved for higher eukaryotes. As was shown previously, the CTCF sites determine the insulator activity of the boundaries of the  Abd-B  regulatory region. In this study, it was shown that fragments of the  Fab-3  and  Fab-4  boundaries of the  abd-A  regulatory region, containing CTCF binding sites, are not effective insulators.

Fragments of the Fab-3 and Fab-4 Boundaries of the Drosophila melanogaster Bithorax Complex That Include CTCF Sites Are not Effective Insulators