, recommending that researchers be allowed to grow human embryos longer under limited conditions.
The original limit was arbitrary and prevented study of a critical period in embryo development — typically between 14 and 28 days, said Robin Lovell-Badge, a stem cell expert at London’s Crick Institute and chair of the group behind the new guidelines. For scientists in the U.K. to start making embryos beyond two weeks, the law regulating such research would need to be changed. Any relaxing of the rule would still need a “robust review” by national regulators, Lovell-Badge said.
Marcy Darnovsky, executive director of the Center for Genetics and Society, said the scientific justification for the new guidelines was still lacking.
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