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In Science this week, researchers at the University of Arizona report that a lateral transfer of fungal genes underlies the red pea aphid's ability to produce carotenoids. Nancy Moran and Tyler Jarvik found that the aphid genome "encodes multiple enzymes for carotenoid biosynthesis" by performing phylogenetic analyses, they were able to show that red aphids have a 30-kb region encoding a single carotenoid desaturase derived from fungal genes, which green aphids do not have.

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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.