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For the first time, researchers here in the us have successfully changed the dna in human embryos. Scientists say it could prevent disease. Others worry it could be used for all the wrong reasons. Heres more from nbcs kristen dahlgren. Kristen dahlgren in a lab in oregon, as scientists fertilized human eggs, they also swapped out some dna, correcting defective genes that carry disease, proving it is possible to genetically modify human embryos, but fueling a growing debate. Eric schadt its one of those things that i think is inevitable. Its going to be hard to control, hard to regulate because the technology is so accessible. Kristen according to Mits Technology review, which first reported on the breakthrough, the scientists used a technique called crispr, already used with partial success in china, essentially a way to cut and paste dna, replacing unwanted genetic information. Scientists say it could someday eliminate inherited diseases, like some cancers, hemophilia, and sicklecell

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