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This third copy is a result of a mistake in cell division.

VOA: special.2009.09.09

So, this is a cell that's infected with a microorganism, it's infected with a virus, let's say it's infected with influenza virus.

这是一个感染了微生物的细胞,它感染了一种病毒,就说是感染了流感病毒吧

耶鲁公开课 - 生物医学工程探索课程节选

This is a cell from connective tissue called a fibroblast.

这是一种结缔组织细胞,叫做成纤维细胞

耶鲁公开课 - 生物医学工程探索课程节选

"This is a stem cell that is generated by the body's own tissue so the immune system does not recognise it and they can get any place they want without being attacked, " said Prof Rambukkana.

BBC: Leprosy bacteria use 'biological alchemy'

It is possible to make a solar cell this way, but it is time-consuming and expensive.

ECONOMIST: Monitor

The scientific basis of all this is that foreskin tissue is rich in a particular sort of cell that HIV likes very much.

ECONOMIST: The XVIIth International AIDS Conference