永久性细胞是一种遭受破坏则成为永久性缺失的细胞，又称非分裂细胞。
永久性细胞已脱离细胞周期，注定要衰老和死亡。
Permanent cells have left the cell cycle and are destined to senesce and die.
奥尔文教授说，“我们发现，移植的干细胞发生了永久性改变，减缓了接受移植肌肉的老化，保持了其力量和质量。”
"We found that the transplanted stem cells are permanently altered and reduce the ageing of the transplanted muscle, maintaining strength and mass," said Prof Olwin.
当前的方法使用病毒或者化学物质向细胞中引入外来dna，但是这些操作将带来永久性的改变，会引起其特有的并发症。
Current methods use viruses or chemicals to bring foreign DNA inside cells, but these make permanent changes, which could have their own complications.
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