eight photos of sythetic mouse embryos in various stages of development

1st synthetic mouse embryos — complete with beating hearts and brains — created with no sperm, eggs or womb

For the first time, scientists have created mouse embryos in the lab without using any eggs or sperm and watched them grow outside the womb. To achieve this feat, the researchers used only stem cells and a spinning device 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 new tab).

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