Last Updated：2025/12/02
During early development, exocoelomic cavities form between the yolk sac and the trophoblast.
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During early development, exocoelomic cavities form between the yolk sac and the trophoblast.
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初期発生の段階で、胚外体腔は卵黄嚢と栄養膜の間に形成される。
