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. 2002 Jun 18;99(13):8956–8961. doi: 10.1073/pnas.122153699

Figure 2.

Figure 2

Phylogenetic tree of the Salmonella clade. The cladogram was constructed with PAUP* software (Sinauer) by using maximum parsimony, equal weight, and 1,000 bootstraps with Y. pestis as the outgroup. Five crucial stages in Salmonella evolution are indicated: 1, divergence of Salmonella from E. coli; 2, separation of S. enterica from S. bongori; 3, evolution of the diphasic S. enterica strains; 4, partition of S. enterica ssp. I; and 5, development of STM. The number of genes predicted to be recruited at each node is shown in Table 3.