Phylogeny of IS5 family transposases. Relationships among IS5 family transposase genes and pseudogenes from the CC26 and MJ02 symbiont genomes, as well as 7 species of free-living relatives (Vibrio alginolyticus XSHD3, Vibrio anguillarum 775, Vibrio mimicus 6, Vibrio vulnificus YJ016, Vibrio sp. strain RC341, and Shewanella oneidensis MR-1) were reconstructed by maximum likelihood analysis. Bootstrap values are color coded, showing that the backbone of the tree has high bootstrap support. Tips are colored black.