这个词是什么意思？
The developmental stage that follows BLASTULA or BLASTOCYST. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D005775 · MeSH 2026。
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