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Researchers in Japan have turned murine embryonic stem cells into fully functioning sperm, which they've also used to fertilize mouse eggs in vitro, says 80beats' Joseph Castro. When the researchers implanted the embryos via surrogate mothers, the pregnant mice produced healthy offspring.

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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.