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Transplanting gut microbiota from old mice into younger, germ-free ones can increase the growth of neurons in the brain and of the intestines, according to a study appearing in Science Translational Medicine. To study the effects of microbiome aging on host physiology, investigators transplanted gut microbiota of old or young mice into young germ-free recipient mice.

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Despite differences in their migration habits, eastern and western monarch butterflies are genetically similar, according to a study in Molecular Ecology.

The UK is implementing COVID-19 testing with a 90-minute turnaround time.

The Chan Zuckerberg Biohub is working with California's health department to sequence viral samples from COVID-19 patients to trace viral introductions, according to the San Francisco Chronicle.

In PLOS this week: identification of fungal species in subcutaneous infections, sequencing of Campylobacter found in raw meat from retail stores, and more.