This Week in Nature

In this week's Nature, a team led by researchers from St. Jude Children's Research Hospital reports an in-depth investigation into the genetics of medulloblastoma, the most common form of childhood brain cancer. By analyzing the genome sequences of 491 medulloblastomas and focusing on altered gene expression in another 1,256 samples, the scientists uncovered novel genetic alterations that drive the disease, including many that specific to different subgroups.

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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.