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In work appearing in this week's edition of PNAS, Tel Aviv University's Ronen Borenstein and Niza Frenkel describe single-step production of viral BACs of the 160-kb human herpes virus 6A. Their method of cloning, they say, is "independent of intracellular recombinations and DNA packaging constraints" and is "especially attractive for viruses that replicate inefficiently and for viruses propagated in suspension 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.

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