Lab-grown human "embryos" and mice gestating in bottles

Wouldn't it be great if we could see embryonic development unfold? Studies published this month suggest we're getting closer. They also raise questions.

What happens early in mammalian development is still a bit of a mystery. What leads some embryos to viability and others to doom? What goes wrong along the way? Can we intervene to make things better?

Bel…

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