Jisho

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はいよう 胚葉
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Noun, Noun which may take the genitive case particle 'no'
1. germ layer; germinal epithelium​
Wikipedia definition
2. Germ layer​A germ layer, occasionally referred to as a germinal epithelium, is a group of cells, formed during animal embryogenesis. Germ layers are particularly pronounced in the vertebrates; however, all animals more complex than sponges produce two or three primary tissue layers (sometimes called primary germ layers). Animals with radial symmetry, like cnidarians, produce two germ layers making them diploblastic.
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