Shared and specific content of the different Legionella species/strains analyzed in this study. Each petal and color represents one genome. The number in the center of the diagram represents the orthologous genes shared by all the genomes. The number inside of each individual petal corresponds to the specific genes of each genome with non-orthologous genes in any of the other genomes. (A) Core genome of five Legionella species including seven L. pneumophila genomes. (B) Core genome when one representative of each Legionella species is taken into account.