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Strands of Four

Researchers have spotted a quadruple-stranded form of DNA within healthy human cells, New Scientist reports. It notes that such four-stranded DNA has been observed before in cancer cells and in some lab settings, but never in healthy human cells.

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NPR reports that researchers have developed chimeric embryos as part of work toward growing human organs in animals for organ transplants.

According to the Washington Post, the Biden Administration is set to make changes to federal restrictions on fetal tissue research.

Texas Monthly looks into the DNA Zoo being collected by Baylor College of Medicine researchers.

In Science this week: approach to isolated trace DNA from archaic humans from sediments, and more.