This Week in Nature

The various campuses of the University of California rejected a set of draft guidelines that would ban free gifts, samples, and lunches for clinicians and medical students as well as outlaw unrestricted grants from industry, says Nature's news section.

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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.