A) Organization of the repetitive SMAG-positive loci in the genome of the S. maltophilia K279a strain. The structure of loci I to XII is diagramatically shown. SMAG sequences are represented as boxes. Repeat units at each locus are highlighted and their size in bp is indicated. B) Allelic variations at SMAG+ loci. Amplimers spanning the loci IX and X derived from the DNA of the indicated S. maltophilia strains were electrophoresed on a 2% agarose gel. Numbers below bands mark the number of repeat units within each amplimer. The 100 bp ladder was used as molecular weight (MW) DNA marker.