The team used freshly harvested eggs from fertile women, instead of ones left over from fertility treatments, as in the past. The most successful work was with eggs from younger women, which, the magazine reported, raised "difficult ethical questions" of increased demand for such material.
"The hormones given to trigger production of extra eggs can cause vomiting, headaches, mood swings and hot flashes, and the long-term consequences of superovulation aren't well understood," Science wrote in an overview article.
The study was funded by grants from the Korean Ministry of Science and Technology.
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