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In an advance, online publication of Nature this week, researchers report that microRNAs 165 and 166 differentially distribute "target mRNAs in the vascular cylinder determines xylem cell types in a dosage-dependent manner." This, the team writes, is itself mediated by the cell-to-cell movement of the transcription factors Short Root and Scarecrow.

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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.