最終更新日：2024/07/28
The chorion is the outermost membrane that surrounds the embryo in the uterus.
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The chorion is the outermost membrane that surrounds the embryo in the uterus.
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The chorion is the outermost membrane that surrounds the embryo in the uterus.
The chorion is the outermost membrane that surrounds the embryo in the uterus.
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