A microscopic spermlike organism contained many of the same tools for cell-to-cell communication found in animals today, two new reports find.
Analysis of DNA from a choanoflagellate, the closest known living nonanimal relative of animals,
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, allows scientists to infer the genetic starter kit possessed by the first animal,
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, the studies suggest.
"It blows open doors for future research,
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," says Nicole King,
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, coauthor on both papers,
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, published this week in the Feb. 15 Science and the Feb. 14 Nature.
Over 600 million years ago, the single-celled choanoflagellates (Latin for "bearing a collar and a whiptail") branched off from the same ancestor that gave rise to animals. Studies of their genetic makeup allow scientists to deduce which genes evolved before or after the transition to multicellular forms.

A glut of Zika cases in Puerto Rico suggests that the virus has a preferred victim: women.
It’s an idea that has come up before,
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, in previous reports from Brazil and El Salvador. But a new analysis from the U.S. Centers for Disease Control and Prevention adds some heft to the story. Of nearly 30,000 Zika cases in Puerto Rico from November 2015 to October 2016,
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, 63 percent were female,
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, the CDC reported online November

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