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In a paper published online in advance in Science this week, researchers at the University of Virginia School of Medicine and the University of North Carolina at Chapel Hill, report on their identification of tens of thousands of "short extrachromosomal circular DNAs — microDNA — in mouse tissues as well as mouse and human cell lines." The team says these 200- to 400-base pair long microDNAs are "derived from unique nonrepetitive sequence, and are enriched in the 5' untransla

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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.

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

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