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Relationship between SGI1 and variants of the SGI1-HKL group via the proposed progenitor SGI1-LK0. Steps leading to the formation of SGI1-LK0, the putative progenitor of the SGI1-HKL group, and then to new forms of the class 1 integron in the SGI1-HKL group are shown as arrows, with a summary of the events needed listed adjacent. The order of the steps is arbitrary. Details of the generation of the variants are shown in Fig. 1 to 5.
