Bacterial residents of the human body often provide beneficial effects, but some can be harmful. The action of gut bacteria has been found to be tightly linked to neurodegeneration in a mouse model of Parkinson's disease.
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Erny, D., Prinz, M. Gut microbes augment neurodegeneration. Nature 544, 304–305 (2017). https://doi.org/10.1038/nature21910
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DOI: https://doi.org/10.1038/nature21910
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