This Week in Science

In Science this week, an international research team reports using CRISPR/Cas9 genome editing to deactivate a family of retroviruses within the pig genome. While pig organs hold promise for transplant medicine, the potential for porcine endogenous retroviruses (PERVs) to infect other cells represents a key limitation.

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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.