This Week in Science

In this week's Science, scientists from the Salk Institute describe how mouse pups that receive less maternal care have more transposons in a certain part of the brain, suggesting that early life experience can influence somatic variation in the genome. In the study, the investigators focused on long interspersed nuclear element–1 (L1) retrotransposons, and found that pups receiving less maternal care exhibited noticeably more transposon replication in the hippocampus.

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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.