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Phylogenetic tree showing the genetic relationship among the strains used in this study on the basis of DNA sequences of invertible elements. The phylogenetic tree was constructed with CLUSTAL, version 1.5 (45). The program initially calculates pairwise similarity scores based on the method of Wilbur and Lipman (50). Based on these scores, the program constructs a phylogenetic tree using the average linkage cluster analysis method (43).
