The human digestive tract, host to an ecosystem teeming with trillions of living bacteria, comes in three variations as distinct as blood groups, according to a new study.
Source: http://www.cosmosmagazine.com/news/4254/new-types-human-gut-bacteria-found
Elisabeth Röhm Elisha Cuthbert Eliza Dushku Emilie de Ravin Emma Heming Emma Stone Emma Watson
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