Figure 3From: Purifying selection in mitochondria, free-living and obligate intracellular proteobacteriaRelationship of K n / K s and mobile elements density for 46 bacterial genomes. Mobile elements density was estimated as the number of mobile elements per megabase of bacterial genome. 31 species of free-living bacteria (orange circles) and 15 species of obligate intracellular bacteria (purple circles).Back to article page