FIG. 1.

YSA pathogenicity island of Y. enterocolitica. Schematic diagram of the YSA PI of Y. enterocolitica (not to scale). Gray flags indicate the locations of TnMod-lacZYA-RKm′ insertions, and black flags indicate the locations of the mTn5-Km2-lacZYA insertion. The orientation of a flag corresponds to the direction of lacZYA transcription. The organization of the ysa locus is based on the published DNA sequence (GenBank accession no. AF005744) and edited based on the recently released genomic sequence of Y. enterocolitica strain 8081 (Sanger Center [www.sanger.ac.uk/Projects/Y_enterocolitica]).