Genetically modified human embryo stirs criticism

But Kathy Hudson, director of the Genetics and Public Policy Center in Washington, D.C., said she's not troubled by the work. She said the idea of successfully modifying babies by inserting genes remains a technically daunting challenge.

"We're not even close to having that technology in hand to be able to do it right," she said, and it would be ethically unacceptable to try it when it's unsafe.

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