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In PLoS Biology this week, investigators at MD Anderson Cancer Center and their collaborators show that "p53 plays an active role in promoting differentiation of human embryonic stem cells and opposing self-renewal by regulation of specific target genes and microRNAs." Further, the team writes, "p53 activates expression of miR-34a and miR-145, which in turn repress stem cell factors OCT4, KLF4, LIN28A, and SOX2 and prevent backsliding to pluripotency." and This study "under

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

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

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

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