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Presence of SPIs in different Salmonella serotypes. (A) A phylogenetic tree was constructed based on chromosomal SNPs of each of the isolates. (B) SPI arrangements are listed with representative sequences of each serotype. Red indicates that SPIs are conserved in all serotypes, yellow indicates insertions of SGIs or plasmids. Other colors represent SPIs whose presence are variable among different serotypes/isolates. (C) The conserved structure across all serotypes is shown.
