A tiny arms race playing out inside the gut could eventually offer a new way to treat out-of-balance microbiomes.
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The mental health toll of caring for COVID-19 patients will need long-lasting attention, as it adds to already demanding professions.
Children and young adults with the inflammatory bowel disease may be less likely to develop perianal fistulas if they receive steroid-sparing therapies.
Researchers are comparing the way genes are expressed in thousands of sperm-forming cells in mice, macaques and humans to look for similarities and differences. This comparison provides clues about how sperm has evolved in mammals.