核被膜(nuclear envelope)

互联网2013-11-15

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真核生物的细胞核的最外层结构, 由两层单位膜所组成。

核被膜的结构比较复杂, 它由外核膜、内核膜、核周腔、核孔复合物和核纤层等5个部分组成。外核膜与内核膜相连, 表面附有大量的核糖体颗粒。内、外核膜间有15～30nm,的透明腔, 称为核周腔, 膜上有孔。

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