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Researchers have discovered the first programmable RNA-guided system discovered in eukaryotes. The technology, known as Fanzor, has the potential to be more easily delivered to cells and tissues than CRISPR-Cas systems, and further refinements could make them a valuable new technology for human genome editing.

In all, five rats received a vitrified-then-thawed kidney in a study whose results were published this month in Nature Communications. It’s the first time scientists have shown it’s possible to successfully and repeatedly transplant a life-sustaining mammalian organ after it has been rewarmed from this icy metabolic arrest.