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Researchers led by Johns Hopkins' Nickolas Papadopoulos found that different versions of the mitochondrial genome can be found in different organs in the same person. As they report in Nature, the researchers used next-gen DNA sequencing, and were able to find single-letter DNA changes that occur in as few as one in 10,000 mitochondria.

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

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

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