FIG. 1.
Organization of the tRNAProL-associated element. The organizations of the chromosomal regions adjacent to tRNA genes in the two S. enterica serovars Typhi and Typhimurium were compared to those of the corresponding regions of the E. coli K-12 and the E. coli O157:H7 chromosome. Genes shared between the E. coli strains and the Salmonella serovars are depicted by black symbols. Genes that are shared only between E. coli strains or Salmonella serovars are depicted by open symbols, while those genes that are specific to a certain strain or serovar are shown by gray symbols. Genes that are associated with virulence are represented by checked patterns, and tRNA genes and genes with similarity to phage genes are shown by hatched and dotted symbols, respectively. The base composition of the specific region of the serovar Typhi chromosome was analyzed and is expressed as percent G+C.