[ScuzzyTerminator]

Lake and Rivera analyzed and compared the genomes of 30 microorganisms selected from the three categories (eukaryotes, bacteria and Archaea). All of the microbes contained about the same number of genes. The researchers then used the computer to produce genome combinations that reflected the most likely ancestors of modern eukaryotes. Their analysis, they say, showed that two ancient prokaryotes —- one most similar to a bacterium, and one an Archaea -— combined genomes out of a mutually advantageous need to survive.

Nothing here proves endosymbiosis.  Lake and Rivera assume endosymbiosis and then show that a bacterium and an Archaea are the "most likely ancestors." That's like pulling thirty people off the street and, by examining their DNA, declaring two of them my "most likely ancestors."

[Ichneumon]

That's like pulling thirty people off the street and, by examining their DNA, declaring two of them my "most likely ancestors."

No it isn't, but it's nice that you're trying.