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In a paper appearing in this week's PNAS Early Edition, a team led by investigators at the Salk Institute for Biological Studies in La Jolla, Calif., shows that, in response to salicylic acid exposure, transposon-associated differentially methylated regions in Arabidopsis thaliana that are accompanied by the upregulation of 21-nt siRNAs are often coupled to transcriptional changes of the transposon and/or the proximal gene.

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According to BBC News, the global vaccine-sharing initiative has sent its first shipment, which arrived in Ghana this week.

CNN reports that a US Food and Drug Administration document says Johnson & Johnson's SARS-CoV-2 vaccine meets the requirements to receive an Emergency Use Authorization.

Researchers in France are developing a new, fast test for SARS-CoV-2 that initial testing indicates may be highly accurate, the Guardian says.

In Cell this week: analysis of fitness patterns among SARS-CoV-2 isolates, single-cell transcriptome analysis of immune features in COVID-19, and more.