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The creation of mitochondria. Rhizobiales and Rickettsiales ancestors diverged approximately 1.5 billion years ago. They both found themselves in a proto-eukaryote after an endosymbiotic event one billion years ago. Genome fusion took place, creating mitochondria and eukaryotes. Mitochondria evolved further by acquiring new elements from other Alphaproteobacteria. Rhizobiales are represented in blue, Rickettsiales in red and other Alphaproteobacteria in green.
