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Evolutionary history of the P. syringae hrp/hrc pathogenicity island. Phylogenetic network based on a concatenated amino acid alignment of the 27 open reading frames that comprise the hrp/hrc gene cluster (7,509 aa) for a sub-set of 54 P. syringae genomes. The network was generated using the NeighborNet method and p-distance in Splitstree 4 software. The phylogroup classifications of lineages based on the core-genome (Figure 1) are color coded.
