When it comes to phylogenetics, researchers are finding out that what they do know is far less than what they don't know. As new species of animals and plants are continually being discovered, it is perhaps not so surprising that there is also still a lot to learn about the world's many kinds of bacteria and archaea and how they have evolved. "Basically, so far, of the known phylogenetic diversity of bacteria and archaea, we have genomic data for about one one-hundredth of a percent of that diversity," says the University of California, Davis' Jonathan Eisen.

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