“Conducting fecal microbial transplants from young mice to old mice, researchers were able to show a reversal of aging-associated differences and a slowing of cognitive impairments.”
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Boehme, M., Guzzetta, K.E., Bastiaanssen, T.F.S. et al. Microbiota from young mice counteracts selective age-associated behavioral deficits. Nat Aging 1, 666–676 (2021). https://doi.org/10.1038/s43587-021-00093-9