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The adenovirus type 5 (Ad5) E1B promoter contains two elements essential for maximal activity, a TATA box and a GC box. The enteric adenovirus type 40 (Ad40) E1B promoter has a TATA box sequence identical to that of Ad5 and a GC box that fits the Sp1 binding site consensus. Nevertheless, Ad40 E1B RNA synthesis is severely impaired in HeLa cells, attributable in part at least to the weak transactivating...
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