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Factor VIII

This article has been updated from a version posted Nov. 13 to correct the name of the National Hemophilia Foundation.

The World Health Organization will be providing low-cost COVID-19 tests to low- and middle-income nations, according to Reuters.

Nobel Prize-winner Arthur Ashkin, who developed optical tweezers, has died at 98, the Washington Post reports.

Nature News examines how the confirmation of Amy Coney Barrett to the US Supreme Court could affect scientific agencies.

In PNAS this week: altered gene expression in brain samples from Alzheimer's disease patients, effects of gene mutations found in bladder cancer, and more.