This Week in PNAS

In the early, online edition of PNAS this week, Japanese and American researchers report on stripped down bacterial genomes developed from the industrial bug Streptomyces avermitilis. By systematically deleting non-essential genes, the team was left with deletion mutations containing between 81 and 83 percent of the original S. avermitilis genome.

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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.