脐孔 umbilical opening
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亦称脐穴、脐。是螺的壳底朝向壳顶的、相当于壳轴的凹陷处。螺的各个壳旋如果紧贴壳轴回旋,则不产生脐孔或者脐孔极不明显,反之若不靠近壳轴回旋,结果就可看到有呈深窪状圆锥形的脐孔形成。蝾螺的脐孔属于前者,蜗牛的脐孔属于后者。
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![BUD31 edg-2=maternal transcript G10 homolog [human, umbilical vein endothelial cells, mRNA, 1003 nt].](https://img1.dxycdn.com/p/s14/2024/0514/752/2760093895118520971.jpg!wh200)
BUD31 edg-2=maternal transcript G10 homolog [human, umbilical vein endothelial cells, mRNA, 1003 nt].
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