Tiny portions of blood collected from Scott Kelly as he orbited the Earth in the International Space Station are being doled out among researchers to study the effect of space on cancer risk, immune function, and more, the Los Angeles Times reports. Those samples are being compared to ones taken from identical twin brother, Mark Kelly, a retired astronaut, who remained on Earth.

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Two researchers have found that behavioral genetic defenses in criminal cases don't tend to affect outcomes, according to Popular Science.

Researchers report that while host genetics influence the oral microbiome, they don't appear to affect cavity-causing microbes, the Economist says.

Pandas' gut microbiomes change as what they eat changes with the seasons, writes Discover's Inkfish blog.

In PLOS this week: comparative genomic study of malaria-linked macaque parasite, search for apple root reference genes, and more.