Mice have a jungle of bacteria, viruses and fungi in their stomachs--and so do we. These microorganisms help both mice and us break down dinner. As we are finding, these bugs also help to regulate the immune system. But we are just starting to learn how these tiny organisms influence us and how changing their composition changes us.
In an attempt to find out, postdoctoral researcher Hachung Chung and her colleagues at Dennis Kasper's Lab at Harvard Medical School tried raising mice with exclusively human gut microbiota.
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