The embryonic membrane involved in the formation of placenta
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Extraembryonic Membranes The embryos of reptiles, birds, and mammals produce 4 extraembryonic membranes, the amnion yolk sac chorion, and allantois In birds and most reptiles, the embryo with its extraembryonic membranes develops within a shelled egg. The amnion protects the embryo in a sac filled with amniotic fluid.
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