NPR

Scientists Make Model Embryos From Stem Cells To Study Key Steps In Human Development

Researchers hope these so-called embryoids could provide crucial new insights into how to treat infertility, prevent miscarriages and birth defects and many diseases. But they stir ethical concerns.
Researchers created a structure using embryonic stem cells that mimics the earliest stages of human development in the womb. This image shows the structure breaking the symmetry of the sphere, which starts the development of more complex structures that eventually develop into a fetus.

Scientists have created living entities that resemble very primitive human embryos, the most advanced example of these structures yet created in a lab.

The researchers hope these creations, made from human embryonic stem cells, will provide crucial new insights into human development and lead to new ways to treat infertility and prevent miscarriages, birth defects and many diseases. The researchers say this is the first time scientists have created living models of human embryos with three-dimensional structures.

The researchers reported their findings Monday in a paper published in the journal Nature Cell Biology.

But the

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