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![Microbiomes of Mice and Men The amount of vitamin A-converting protein, shown in green, varies between the guts of normal mice (CV) and mice without gut bacteria (GF). Image courtesy Vaishnava Lab/Immunity](https://medicine.at.brown.edu/wp-content/uploads/2018/12/GutMicrobiome-351x185.jpg)
Microbiomes of Mice and Men
Gut bacteria regulate the intestinal immune system by moderating vitamin A levels.