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Schematic diagram of the brpA locus and its flanking region. ORF1 and -2 encode hypothetical proteins; ORF4 codes for a protein of the histidine triad family; and ORF5 and ORF6 encode an ATP-binding protein and a permease of the ABC transporter system, respectively. Arrows represent the orientation of each individual ORF, and the numbers underneath indicate their respective positions in the chromosome.
