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When we admire a creature like a lizard, starfish, or worm that can regenerate body parts after an injury, we’re really marveling at two qualities: these animals’ ability to regrow, and to stop regrowing. Because, in fact, a high degree of genetic precision is required to taper off growth signals that, when left unchecked, are a hallmark of cancer.
Scientists are fixated on this tightrope of regulated growth to one day help humans heal from heart attacks and other...