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Not Wanted

A Stanford University study suggests that, like organ transplants, human embryonic stem cells may come with a high probability of rejection. Joseph Wu and his colleagues injected hESCs into mice with compromised immune systems and into normal mice. The mice with compromised immune systems did well while the others died within 10 days. "[This result is] not a disappointment, it's more of a reality check," Wu says at sciam.com. "I think there's some promise [to hESCs], but you don't want to be foolish and say these cells are going to cure things in the next five years."

The Scan

Purnell Choppin Dies

Purnell Choppin, a virologist who led the Howard Hughes Medical Institute, has died at 91, according to the Washington Post.

Effectiveness May Decline, Data From Israel Suggests

The New York Times reports that new Israeli data suggests a decline in Pfizer-BioNTech SARS-CoV-2 vaccine effectiveness against Delta variant infection, though protection against severe disease remains high.

To See Future Risk

Slate looks into the use of polygenic risk scores in embryo screening.

PLOS Papers on Methicillin-Resistant Staphylococcus, Bone Marrow Smear Sequencing, More

In PLOS this week: genomic analysis of methicillin-resistant Staphylococcus pseudintermedius, archived bone marrow sequencing, and more.