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细胞核的核仁是由位于某些染色体上特殊部位的核仁组成区(Nucleolar Organi-zer Region NoR)所产生.在人类的染色本组中,D组的第13、14、15对及G组的第21、22对染色体的短臂上有明显的次缢痕区,认为该处即是该仁组成区.其作用之一就是与其他核仁成分组织在一起形成核仁,并因此而得名.同时,该处也是该糖体核糖核酸基因(rDNA)所在的位置,它通过转录合成核糖体RNA(rRNA),从而影响细胞的蛋白质成合.NOR可用银染方法显示,但很所结合的部位即非NOR的rDNA,亦非其rRNA,而是与rRNA相关的酸性非组蛋白,故这种蛋自被称为核仁组成区相关嗜银蛋白(Ag-NoR),
The nucleolus nucleus is produced by the Nucleolar Organizational Zones (NoRs), which are located on specific chromosomes of some chromosomes.In the human staining group, the 13th, 14th, and 15th of Group D and the G Of the 21,22 pairs of chromosomes on the short arm there is a significant secondary mark area, that is the kernel area. One of its role is to organize with other nucleolar components to form nucleoli, and thus derived At the same time, the site is also where the ribosomal RNA gene (rDNA) is located, which affects the cellular protein synthesis by transcriptional synthesis of ribosomal RNA (rRNA), which is shown by silver staining, Which is not a non-NOR rDNA, nor is it rRNA, but an acidic non-histone associated with rRNA, so this egg is known as Ag-NoR,