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Whether drug-selectable genes can influence expression of the β-globin gene linked to its LCR was assessed here. With the tkNeo gene placed in cis and used to select transfected cells, the β-globin gene was expressed fourfold lower when it was positioned upstream of the LCR rather than downstream. This difference did not occur when the pgkPuro gene replaced tkNeo. Moreover, the β-globin gene situated...
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