Describe the role of zebrafish in the protgut.
Describe the role of zebrafish in the protgut.
发布时间：2025-05-30 07:45:55
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答案：原肠作用开始于胚盘细胞向植物极方向的卵黄下包，由YSL（卵黄多核层）驱动，使胚盘变薄。
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