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PFGE of pairs of isolates with identical allelic profiles. Chromosomal DNA from pairs of isolates of STs 25 (lanes b and c), 30 (lanes d and e), 34 (lanes f and g), 36 (lanes h and i), 39 (lanes j and k), 45 (lanes l and m), 47 (lanes n and o), and 49 (lanes p and q) were digested with SmaI and were separated by PFGE. Concatenated bacteriophage lambda molecular size markers were run in lanes a and r. Numbers on the right are in kilobase pairs.
