NEW YORK (GenomeWeb) – Researchers have uncovered 20 genetic loci that may explain why some people burn while others tan in response to sun exposure.

Whether or not someone can tan is determined by the ability of melanocytes to ramp up melanin production after exposure to ultraviolet radiation, and burning, rather than tanning, is a risk factor for developing skin cancer. In the US alone this year, about 91,270 new cases of melanoma are expected, according to the National Cancer Institute.

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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.