Relationships between genomes based on accessory gene content. (a) Phylogenetic network constructed using genes shared by 2-13 genomes with a ML distance estimator and represented as a neighbor net with bootstrap values as implemented by SplitsTree 4.8. (b) Number of occurrences of different genome pairs (indicated as 'x+y') among protein families containing only two genomes. Only those pairs including either WH5701 or RS9917 (or both) are shown, as well as the two most related genome pairs BL107/CC9902 and WH7803/WH7805, shown here for comparison.
Dufresne et al. Genome Biology 2008 9:R90 doi:10.1186/gb-2008-9-5-r90