The results of Jasin’s experiment were astounding. She succeeded in inducing a whopping 10 percent of the cells to precisely repair a mutated gene by homologous recombination, a success rate that seems low now but that was hundreds of times higher than what scientists had managed to achieve previously. It was the most promising evidence yet that this process might allow scientists to rewrite the code of the genome without the risk of illegitimate recombination or random splicing from retroviral vectors.
