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Gel mobility shift assays of txeR-recognized promoters. DNA fragments containing the putative P1txeR promoter (A) or the putative P2txeR promoter (B) were incubated with E. coli RNA polymerase core enzyme alone or in the presence of TxeR. The triangles indicate the use of increasing amounts of TxeR-containing holoenzyme (50, 100, and 200 nM).
