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AP News Guide: Summit opens debate on ethics of gene editing

In this photo provided by UC Berkeley Public Affairs, taken June 20, 2014, Jennifer Doudna, right, and her lab manager, Kai Hong, work in her laboratory in Berkeley, Calif. Designer babies or an end to intractable illnesses: A revolutionary technology is letting scientists learn to rewrite the genetic code, aiming to alter DNA in ways that, among other things, could erase disease-causing genes. How far should these experiments try to go _ fix only the sick, or make changes that future generations could inherit? (Cailey Cotner/UC Berkeley via AP)

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