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Biochemical probes positioned on the surface of the general transcription factor TFIIB were used to probe the architecture of the RNA polymerase II (Pol II) transcription preinitiation complex (PIC). In PICs, the TFIIB linker and core domains are positioned over the central cleft and wall of Pol II. This positioning is not observed in the smaller Pol II-TFIIB complex. These results lead to a new model...
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