一般认为，地球上生命的演化或进化历史包含了从原始的前细胞进化出原核细胞进而到真核细胞的复杂过程。但是，细胞到底是如何起源的依然是现代生命科学中依然未解的最大谜团之一。原核细胞的成型也就标志着原始地球上生命的正式诞生，而真核细胞的诞生伴随了地球生命的空前繁荣。
脑原发肿瘤一般都被认为是胶质细胞起源的。
The most common primary tumors of the human brain are thought to be of glial cell origin.
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.
体细胞胚起源于胚性愈伤组织中含单宁的细胞包围的单个胚性母细胞，属于单细胞起源。
The somatic embryo originated from single embryonic original cell of embryonic callus tissues, which was surrounded by tannin cells, that belonged to single cell origination.
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