Lab-made mouse embryos grew brains and beating hearts, just like the real thing

Scientists coaxed mouse stem cells to develop into artificial embryos that started growing hearts and brains, similar to the true factor.

The lab-made embryos, crafted with none eggs or sperm and incubated in a tool that resembles a fast-spinning Ferris wheel filled with tiny glass vials, survived for 8.5 days. That’s practically half the size of a typical mouse being pregnant. In that point, a yolk sac developed across the embryos to produce diet, and the embryos themselves developed digestive tracts; neural tubes, or the beginnings of the central nervous system; beating hearts; and brains with well-defined subsections, together with the forebrain and midbrain, the scientists reported in a research revealed Thursday (Aug. 25) within the journal Nature (opens in new tab).

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