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Scientists are growing increasingly large and sophisticated clusters of human brain cells. Ethicists are now wondering what to do if these minibrains start thinking.
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The hospital system said its investigation suggested that the problems may have been caused by human error, mechanical failure or both. "We failed our fertility clinic patients," said its CEO.
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The problem hit a San Francisco clinic on March 4 — the same day that a similar cryogenic tank failure was reported in Cleveland.
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Researchers disabled a gene that they think helps determine which human embryos will develop normally. The technique they used is controversial because it could be used to change babies' DNA.
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The news that scientists have successfully cloned a human embryo seems almost certain to rekindle a political fight that has raged, on and off, since the creation of Dolly the sheep. It's a fight that has, over the past decade and a half, produced a lot of heat and light and not a lot of policy.