mesoderm mesoderm
中胚层中胚层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At this stage the structure, though still just a featureless ball of cells, has started to differentiate into the body's three basic cell types (known as endoderm, mesoderm and ectoderm).
ECONOMIST: An embryonic development
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