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Researchers from Yonsei University and other centers in Korea search for guide RNAs to target specific KRAS mutations in cancer cells using the CRISPR-Cas9 genome-editing approach. After screening for effective KRAS-editing guide RNAs in a cell line containing a fluorescent reporter system, the team validated the most promising guide RNAs in cancer cell lines with wild type KRAS or versions of the gene containing mutations of interest.

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A new analysis suggests warming, not the arrival of humans, led to the extinction of the woolly rhinoceros thousands of years ago, the Economist reports.

Chinese health officials uncovered SARS-CoV-2 viral RNA on imported frozen food, but the New York Times reports catching COVID-19 that way would be unlikely.

The UK has ordered 60 million coronavirus vaccine doses from Novavax and 30 million doses from Janssen, according to the Guardian.

In Science this week: machine learning model predicts whether ion channel mutations will cause disease, and more.