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In Genome Biology this week, scientists at the University of Rochester studied the evolution of R1 and R2 retrotransposons across 12 Drosophila genomes. These specifically insert into the 28S rRNA genes. They found that most copies of R1 and R2 in each species were found to exhibit less than 0.2% sequence divergence, suggesting that all copies are relatively new.

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The US Centers for Disease Control and Prevention has identified a small group of breakthrough COVID-19 cases, the Wall Street Journal reports.

The New York Times reports that the US Department of Defense is to use genetic genealogy approaches to identify the remains of unknown soldiers.

Vox and Nature discuss the importance of preparing for the next pandemic.

In Nature this week: comparison of five circulating tumor DNA assays, resequencing analysis of lettuce gives insight into its domestication, and more.