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Neighbor-joining tree of the E622/TnE622 inverted repeats. Three distinct phylogenetic groups are represented, with group I consisting solely of elements from P. syringae, group II consisting of elements from several different pathogens in addition to P. syringae, and group III consisting of E622/TnE622 elements from the cyanobacteria. Species marked with asterisks have only one IR represented in the phylogeny. All accession numbers are available in Table S1 in the supplemental material.
