This Week in Science

This week in Science, scientists from the Institut National de Recherche Agronomique in France publish the genome sequence of Brassica napus, the plant from which canola oil is derived. B. napus is an allopolyploid, with chromosomes from Asian cabbage and Mediterranean cabbage that were found to continuously exchange corresponding genetic material. Such gene conversion events, the researchers say, appear to have been selected by humans as part of crop improvement.

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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.