gastrula

柯林斯词典

gastrula /ˈɡæstrʊlə/

• 1. N a saclike animal embryo consisting of three layers of cells (ectoderm, mesoderm, and endoderm) surrounding a central cavity (archenteron) with a small opening (blastopore) to the exterior 原肠胚→see also ectoderm , mesoderm , endoderm

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