Nucleolar structure is one of the most obvious symbols. However, little is known about its evolutionary origin. Some previous studies implied that Giardia has no nucleolus.
核仁是真核细胞最显著的标志之一，但关于其进化上的起源迄今仍所知甚少，已发现有迹像表明原始性真核生物贾第虫没有核仁。
These changes are discussed in relation to current knowledge about nucleolar structure as well as the organization of chromosomes and transcription factories in nuclear regions outside the nucleolus.
讨论了涉及到有关核仁结构的当前知识的这些变化，以及在核仁外部的细胞核区域中染色体和转录工厂的组织。
In all the nucleolar cycle, nucleolar FCs and DFCs structure changed.
在整个核仁周期中，核仁的FC和DFC结构组分发生变化。
The larger nucleolus was higher in electron-density, but the inside structure was not even, sometimes there was a very large nucleolar vacuole in it.
大核仁电子密度较高，质地不均匀，有时有一个体积很大的核仁泡位于其中。
The larger nucleolus was higher in electron-density, but the inside structure was not even, sometimes there was a very large nucleolar vacuole in it.
大核仁电子密度较高，质地不均匀，有时有一个体积很大的核仁泡位于其中。
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