Gut-dwelling microbes and evolution

Short article from New Scientist here.

Quick excerpt from the article:

Jeff Gordon and Ruth Ley, microbiologists at Washington University in St. Louis, tried this approach with stool samples collected from zoos and from animals in the wild.

They found more than 20,000 different kinds of bacteria. But the closer two species were on the tree of life, the more bacterial species they had in common living in their guts.

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