A human embryo grown in a lab without a sperm or egg could be a revolutionary new way to test medicines that may help prevent miscarriage and genetic diseases

Tech Insider
The top sphere contains the part that will become the embryo itself, capped by the amnion; the bottom sphere is the yolk sac; the interface between them is a critical structural feature of human embryonic development. The two spheres are encapsulated by a cellular layer that will become the placenta.
Scientists built the model embryo, imaged here. The outer ring is the placenta forming.

Weizmann Institute of Science

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