This Week in Nature

A news story examines the fate of using surrogate biomarkers in clinical trials. So far, reliance on markers that don't necessarily correlate with a disease itself has helped "fast-track" many drugs through the FDA approval process. Surprising findings about drugs, like GSK's Avandia, have people questioning dependence on these kinds of markers.

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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.