Fig 1.

Schematic view of the SGI1 backbone and its specific features encountered in various Salmonella enterica serovars. Gray arrows correspond to chromosomal genes flanking SGI1. DR-L and DR-R are the 18-bp left and right direct repeats, respectively, bracketing SGI1. The 5-bp transpositional target sites of complex integrons InSGI1-J and all others are indicated in ORF S023 and between the res gene and ORF S044, respectively. The three different IS elements are indicated by boxes containing black hatched arrows representing the transposase genes. Extended views of the insertion site in the SGI1 backbone are schematized below the map within boxes. The SGI1 variants, the Salmonella enterica serovars, and geographical origins are indicated for each genetic feature.