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PFGE after ApaI restriction digestion. Lane 1, lambda ladder; lane 2, Washington isolate WA8; lane 3, 19F isolate from CDC; lane 4, 23F isolate from Spain; lanes 5 and 6, 19A isolates from South Africa; lane 7, 6B isolate from Spain; lane 8, 6B isolate from South Africa; lane 9, 9V isolate from France. The numbers on the side represent molecular weight standards in kilobases.
