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In recent years, scientists have moved beyond in vitro fertilization. They are starting to assemble stem cells that can organize themselves into embryolike structures.

Soon, experts predict, they will learn how to engineer these cells into new kinds of tissues and organs. Eventually, they may take on features of a mature human being.

In the report, John D. Aach and his colleagues explored the ethics of creating what they call “synthetic human entities with embryolike features” — Sheefs, for short. For now, the most advanced Sheefs are very simple assemblies of cells.

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Image: By Stemcellscientist – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=19106655

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