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In Cell this week, a team led by researchers at the University of Wisconsin-Madison shows that the mitochondrial deacetylase "Sirt3 is an essential player in enhancing the mitochondrial glutathione antioxidant defense system" during caloric restriction in mice, and that consequently, it "slows the progression of age-related hearing loss." The team found that, in wild-type mice, caloric restriction "reduces oxidative DNA damage in multiple tissues and prevents AHL," but it does not do so in

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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.