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Should we rethink our legal definition of a human embryo?


Scientists can now create embryo-like structures from animal and human stem cells in the lab, and recently, researchers unveiled the most advanced human embryo models yet, which resemble natural embryos up to 14 days after fertilization.

But this research has raised legal and ethical questions about what an embryo is and how lab-made models should be used. So some scientists argue that the legal definition of an embryo should be changed.

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