Mammals: The chorion is the outermost layer of fetal membranes.
Poultry: The chorion is the membrane that surrounds the yolk sac and amnion of the developing embryo in an egg.
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Mammals: The chorion is the outermost layer of fetal membranes.
Poultry: The chorion is the membrane that surrounds the yolk sac and amnion of the developing embryo in an egg.
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