Scientists have developed human embryo-like structures without using sperm, an egg or fertilisation, offering hope for research on miscarriage and birth defects but also raising fresh ethical concerns.
Earlier this year, several labs around the world released pre-print studies that had not been peer-reviewed, describing their development of early human embryo-like structures.
But now one group's research has been published in the peer-reviewed journal Nature, describing how they coaxed human embryonic stem cells to self-organise into a model resembling an early embryo.
The research was welcomed by some scientists as an "impressive" advance that could help unlock secrets about the precarious early stages of pregnancies, when failure is most common.
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