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In Science Signaling this week, researchers in Germany report on their loss-of-function RNAi screen which revealed Ras- and Raf-independent MEK-ERK signaling in human epithelial cells during Chlamydia trachmatis infection. Their study also identified 59 host factors that either positively or negatively influenceChlamydia replication; depletion of Ras or Raf in HeLa cells increased the pathogen's growth.

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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.