Mice that had been genetically engineered to develop tumours failed to do so. Instead, the animals grew up to be huge and very hairy. And when the tips of the pups’ toes were clipped off in a routine tagging procedure, they often grew back. What was different about these mice was that they carried a protein, Lin28a, which is generally produced only in developing embryos. Lin28a has already garnered attention for its involvement in the functioning of stem cells and in cancer. A study published today in Cell now shows that this protein can improve tissue repair — even in adults. In mice genetically modified to produce the protein throughout their lives, the animals’ hair grew faster than normal and puncture wounds in their ears healed almost completely.
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