This Week in PLOS

Relaxation practices such as yoga, meditation, and repetitive prayer are associated with shifts in the expression of metabolic, immune, and stress response pathways genes, according to a study in PLOS One. A Massachusetts-led team did array-based gene expression analyses on blood samples from 26 healthy individuals over eight weeks, as each embarked on a relaxation response program.

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US Attorney General Jeff Sessions is considering using DNA tests to determine relatedness between adult and child migrants, the Daily Caller reports.

Bloomberg reports that Brainstorm Cell Therapeutics plans to offer a treatment it is developing under the "right to try" law for hundreds of thousands of dollars.

In Nature this week: expansion of disease-resistance genes among long-lived oak trees, and more.

In a proof-of-concept study, researchers report being able to determine age from dried bloodstains, Discover's D-brief blog reports.