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Mitinori Saitou at Kyoto University first documented in 2018 how his team turned human blood cells into stem cells, which they then transformed into human eggs, but they were too immature to be fertilized to make embryos.
US startups Conception Biosciences, Ivy Natal, Gameto, and Ovelle Bio are all working on making eggs or sperm in a lab.
But the prospect raises significant ethical questions about how the technology should be used. In a 2017 editorial, bioethicists warned that IVG “may raise the…
