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Purification and characterization of the stage-specific embryonic enhancer-binding protein SSAP-1.
Mol Cell Biol
March 1993
Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York 10461.
We have demonstrated that a highly conserved segment of DNA between positions -288 and -317 (upstream sequence element IV [USE IV]) is largely responsible for the transcriptional activation of the sea urchin H1-beta histone gene during the blastula stage of embryogenesis. This sequence is capable of acting as an embryonic enhancer element, activating target genes in a stage-specific manner. Nuclear extracts prepared from developmentally-staged organisms before and after the gene is activated all contain a factor which specifically binds to the enhancer.
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