New guidelines for the diagnosis of Alzheimer's disease are to be released today by the National Institute on Aging and the Alzheimer's Association, reports The New York Times. The new definition breaks the disease down into three stages: when dementia has set in, when there are symptoms, but the person can still perform daily tasks, and when there are not yet symptoms, but changes are occurring in the person's brain. That early, symptom-free stage would be assessed through biomarkers.

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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.