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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.
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banana stuck in donut hole against starry galaxy space background
Space sex could be on the horizon.
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