This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, researchers from Stanford University and the Chan Zuckerberg Biohub describe results from a T cell receptor beta-chain sequencing and immune profiling analysis of blood, tumor, and matched normal breast tissue samples from more than a dozen individuals with early-stage breast cancer.

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In Science this week: a CRISPR screen identifies sideroflexin 1 as a requisite component of one-carbon metabolism, and more.

Though many details have yet to be worked out, the draft deal for the UK's withdrawal from the EU is giving researchers some hints for what they can expect, Nature News says.

DNA testing has solved a 100-year-old mystery contained in the skull and teeth samples of a now-extinct monkey that once inhabited Jamaica, Gizmodo reports.

As the UN ponders a ban on gene drives, one malaria researcher says there are less dramatic ways to fight the disease in Africa than unleashing GM mosquitoes on a whole continent.