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Another notable thing about the research, which was published in the journal Nature: The team paid the women who provided the eggs used in the study, a practice that has been forbidden by ethical guidelines from scientific organizations around the world. Some ethicists have argued that paying women for their eggs might create an exploitative trade. But in this case, it may be the reason why the researchers were able to collect enough healthy eggs (they used 270 in all) to get their historic result.
Teams have "tried to recruit donors on altruistic grounds and failed," said New...