粗面内质网(rough endoplasmic reticulum, RER)

互联网2013-11-15

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多呈大的扁平膜囊状, 在电镜下观察排列极为整齐。它是核糖体和内质网共同构成的复合机能结构, 普遍存在于分泌蛋白质的细胞中, 越是分泌旺盛的细胞(如浆细胞)越多, 未分化和肿瘤细胞中较少。其主要功能是合成分泌性的蛋白质、多种膜蛋白和酶蛋白。粗面内质网与细胞核的外层膜相连通。

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