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Stanford University School of Medicine's Ben Barres and his colleagues identified a molecular on-switch that catalyzes the transformation of immature brain cells into myelin-producing oligodendrocytes. In a study to be published in today's Neuron, the scientists found that the microRNA molecule miR-219 is found at high levels only in oligodendrocytes and that it's necessary to induce these brain cells' precursors to mature.

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Researchers are developing a breath test to determine how severe patients' methylmalonic acidemia disease is, FierceBiotech reports.

NPR reports that vaccine developers are working on SARS-CoV-2 vaccines that are easier to store or administer than the current crop.

Reuters reports that France is to recommend that people under 55 who received one dose of AstraZeneca's SARS-CoV-2 vaccine receive a different vaccine for their second dose.