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FIG. 3. Organization of the UG gene. The three exons are black boxes, and the intervening introns are open boxes. PRE designates a cluster of progesterone response elements. The 404-bp BamH1 rabbit promoter (–394/+10) is enlarged to show the locations of an ERE, two Sp1/3 binding sites, a SOX17 site, a RUSH (RUSH/SMARCA3) site, and a YY1 site juxtaposed to the TACA box. The cis-binding sites that are most important in the rabbit promoter are shown in bold relief against less important elements.
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