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Dave Bartel's lab at MIT has checked in on the origins of small RNAs, finding miRNAs and piRNAs from animal phyla that diverged before the emergence of the Bilateria, including the starlet sea anemone and the sponge. The anemone has many miRNA genes, two classes of piRNAs, and a complement of proteins specific to small-RNA biology comparable to that of humans.

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Novavax has begun a phase III trial of its SARS-CoV-2 vaccine, according to the New York Times.

Vox reports that the Trump Administration may limit student visas for individuals from some countries to two years.

The governor of New York says the state will conduct its own review of any SARS-CoV-2 vaccine, NPR reports.

This week in Science: Neanderthal Y chromosomes replaced by Homo sapiens Y chromosomes, and more.