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Schematic representation of the EcoRI hybridization profiles of the genomic DNA of 80 strains of Y. pseudotuberculosis obtained after hybridization with an E. coli 16S+23S rRNA probe. A solid arrow points to a band conserved in all strains, and a dotted arrow points to a band present in all except two strains. Tick marks with numbers on the left indicate the sizes (in kilobases) of the molecular mass standards (Xenorhabdus sp. strain 278).
