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PFGE profiles of AvrII-cleaved genomic DNAs from West Lothian (lanes 1 to 3), Highland (lanes 4 and 5), and central Scotland (lanes 6 to 9) outbreak isolates. Lane 10, bacteriophage lambda concatemer size markers. The fragment identifying central Scotland isolates is indicated by A. The fragment absent from central Scotland isolates but present in both West Lothian and Highland isolates is indicated by B. The unnumbered lanes correspond to lanes 1 to 10 from left to right, respectively.
