First synthetic mouse embryos – with beating hearts and brains – created without sperm, egg or uterus

For the first time, scientists have created mouse embryos in the lab without using eggs or sperm and watched them grow outside the womb. To achieve this feat, the researchers used nothing but stem cells and a spinner filled with shiny glass vials.

The experiment is a “game changer,” Alfonso Martinez Arias, a developmental biologist at Pompeu Fabra University in Barcelona who was not involved in the research, told the Washington Post (opens in a new tab).

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