围绕着真核细胞起源的激烈争执使得这一切景象显得扑朔迷离。
Much of this picture has been obscured by the swirling controversies that surround the origin of the eukaryotic cell.
他们还提示，自真核细胞生物钟起源以来，这一生物化学的机制在进化的时候得到了保留。
They also suggest that this biochemical mechanism has been conserved over evolutionary time, since the actual origin of eukaryotic circadian clocks.
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。
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.
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