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Schematic structures of the TFIIB and pX ORFs. The pX regions required for specific binding to RPB5 of POLII (9) and to TFIIB (23) are designated with the residues at the boundaries. The TFIIB regions of the zinc finger and the direct repeat are shown as dark boxes. Also designated are the regions of TFIIB required for interaction with POLII and TBP (5, 19, 37).
