Researchers from Massachusetts General Hospital and Harvard Medical School have developed a microfluidic device that can be used as an alternative to flow cytometry for measuring T cell counts in people infected with HIV. They hope that the small handheld device will help Africans — it will first be tested in Rwanda — in poor regions to better manage their disease.

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The UK's Nuffield Council on Bioethics says genetically modifying human embryos could be morally permissible, according to the Guardian.

A new Nature Biotechnology paper reports that CRISPR-Cas9 gene editing can lead to large deletions or complex rearrangements that could be pathogenic.

The Wall Street Journal likens a prototype developed by Synthetic Genomics to a "biological fax machine."

In PNAS this week: strategy for reactivating Rett syndrome-linked MECP2, small molecules able to suppress Staphylococcus aureus virulence, and more.