gastrula invagination
... gastrula 原肠胚 gastrular invagination 原肠胚内陷 gastrular mesoderm 原肠中胚层 ...
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·2,447,543篇论文数据，部分数据来源于NoteExpress
结果表明，单环刺消化道起源于原肠胚期内陷而成的原肠腔；
The results showed that, the digestive canal initiated from the gastrocoele, which was formed by invagination at gastrula stage.
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