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During development, cascades of regulatory genes act in a hierarchical fashion to subdivide the embryo into increasingly specified body regions. This has been best characterized in Drosophila, where genes encoding regulatory transcription factors form a network to direct the development of the basic segmented body plan. The pair-rule genes are pivotal in this process as they are responsible for the...
Hox genes encode DNA binding transcription factors that regulate the body plans of metazoans by regulating the expression of downstream target ‘realizator genes’ that direct morphogenesis and growth. Although some Hox target genes have been identified, the code used by Hox proteins to select regulatory targets remains elusive. This failure is due, in part, to the overlapping and promiscuous DNA binding...
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