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PFGE analysis of N. meningitidis strains used in this study. Chromosomal DNA from the respective strains was digested with NheI and subjected to electrophoresis. Clustering was performed using the Dice coefficient and a 1.2% optimization setting. The dendrogram was generated using the unweighted pair group method using arithmetic averages (UPGMA). The numbers on the scale represent the Dice coefficient, which reflects the similarity of electronic bands.
