最終更新日：2024/08/06
The umbilicovitelline duct connects the yolk sac to the embryo.
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The umbilicovitelline duct connects the yolk sac to the embryo.
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The umbilicovitelline duct connects the yolk sac to the embryo.
The umbilicovitelline duct connects the yolk sac to the embryo.
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