Figure 1From: Purifying selection in mitochondria, free-living and obligate intracellular proteobacteriaThe phylogenetic tree of the analyzed species. Green – mammals, purple – obligate intracellular bacteria (endosymbionts in gamma- and parasites in alpha-proteobacteria), orange – free-living bacteria. The branch lengths represent the K n /K s values obtained in model 2c (K n /K s of each external branch were estimated independently, while K n /K s of internal branches were estimated as a constant for each sub-tree.) The dotted line reflects the hypothetical origin of mitochondria from an ancestor common with Rickettsiales.Back to article page