Primitive streak
Primitive streak
发布时间：2025-06-10 19:48:51
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由 快搜搜题库 官方老师解答 )
答案：即原条，人胚发育的第3周初，部分上胚层细胞增殖较快，在上胚层正中线的一侧形成一条增厚区，称原条。
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