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Science's special section this week looks at the cell's nucleus. A news story chronicles the search for the spindle matrix, a still-hypothetical cellular structure that may underlie the spindle. Kristen Johansen and Jørgen Johansen have uncovered four matrix protein candidates and Yixian Zheng has isolated RanGTPase which triggers spindle formation in frog eggs.

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New analyses indicate the P.1 variant found in Brazil may be able to infect people who have already had COVID-19, the New York Times reports.

According to CNBC, Novavax's CEO says its vaccine could be authorized in the US as early as May.

The US National Institutes of Health has a new initiative to address structural racism in biomedical research.

In PNAS this week: GWAS of TLV-1-associated myelopathy/tropical spastic paraparesis, analysis of twins with hypertrophic cardiomyopathy, and more.