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Pulsed-field gel electrophoresis (PFGE) of ApaI restricted, virulent Dichelobacter nodosus isolates belonging to serogroup A from Norway and Denmark. Lanes: 1 and 7, lambda ladder molecular size marker; 6, D. nodosus ATCC® 27521 reference strain; 2 and 5, isolates from Denmark; 3–4, isolates from Norway. Numbers to the right indicate molecular size (kilobases).
