They are investigating whether genetically modified stem cells - the body's master cells that can grow into any kind of cell - can be used to treat AIDS patients.

他们正在研究转基因干细胞是否可以用于治疗艾滋病患者。干细胞是人体的主干细胞，可以分化生长成任何类型的细胞。

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Animal tests, described in the journal Cell Stem Cell, have now used modified skin cells to repair the insulation.

BBC: Skin 'may restore' diseased MS brain

But a modified approach that does not involve viruses is likely to be the ultimate way of making human stem cells.

ECONOMIST: Human embryonic stem cells