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The selective pressure of nutrient availability can influence the protein-coding genome of marine microbes, suggesting a role for the environment in the evolution of the genetic code, according to a study in Science this week. Nitrogen and carbon are major limiting factors in a variety of ecosystems and their availability is believed to be a strong selective force among microbes, which have evolved to optimize nutrient use.

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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.