hypoblast ; hypenchyme
·2,447,543篇论文数据，部分数据来源于NoteExpress
并多数发生于于叶与下胚轴的深层。胚性细胞团周围细胞退化，使其与周围组织之间形成间隙。
The surrounding cells of the embryonic cell groups degenerate, such there is the space between the groups of cell and the surrounding tissue.
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