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Explore the Human Microbiome [Interactive]

Learn about the bacteria, fungi and other micro-organisms that maintain human health.

The body contains 10 times more bacteria, fungi and other micro-organisms than human cells. Most of these species are harmless—although they can still cause illness if they wind up in the wrong place. In addition, researchers are beginning to learn exactly how some microbial species in the body help digestion and contribute to regulation of appetite and the immune system.  

Illustration by Bryan Christie

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