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In a new study in PNAS, researchers at Penn State and the University at Buffalo say their analysis of polar bear DNA has led them to extend to origin of the species back to five million years instead of 600,000 years, reports The New York Times' James Gorman.

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The US has sent its formal notice of withdrawal from the World Health Organization, according to the Wall Street Journal.

Science reports that a draft spending bill would increase the US National Institutes of Health budget by 13 percent.

The Harvard Crimson reports that Harvard and MIT are suing the Department of Homeland Security and ICE over the new international student visa policy.

In Nucleic Acids Research this week: algorithm to determine molecular sequence types and other microbial features, computational method to uncover R-loop structures, and more.