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DNA sequence alignment of the fla promoter region from the ΔearA and ΔearA-sp strains showed a three adenine deletion in the BRE region. The four EarA binding sites (sites 1–4), BRE, TATA box, and ribosome binding site (RBS) are boxed in the figure. The transcription start site (TSS) and the start codon of the first gene in the fla operon, flaB1, are also indicated.
