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Potential sites used for the development of Tn559 via recombination between a dfrK-carrying plasmid and a Tn554-like transposon. Vertical bars indicate identical bases compared to the Tn559 sequence. The recombination sites, where crossover is believed to have occurred, are boxed. The sequence displayed in bold underlined type in Tn559 and pKKS2187 represents the 3′ end of the dfrK gene.
