The gut microbiome may be a causal factor of kwashiorkor, a form of severe malnutrition, researchers from Washington University in St. Louis report in Science. WashU's Jeffrey Gordon and his colleagues studied the gut microbiomes of 317 Malawian twin pairs until they turned three. They then focused on nine, well-nourished, same-gender twin pairs and 13 same-gender twin pairs in which one twin developed kwashiorkor.

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Publication of He Jiankui's work on gene-edited infants would raise ethical concerns for journals, Wired and others report.

The New York Times reports that evidence linking trauma in one generation to epigenetic effects that influence subsequent generations may be overstated.

ScienceInsider reports that US National Institutes of Health researchers were told in the fall they could not obtain new human fetal tissue.

In PNAS this week: skin pigmentation evolution among KhoeSan, biomarkers for dengue virus progression, and more.