These interventions are risky. Transplanted cells often develop in an uncontrolled manner, which frequently leads to cancer.

但这种措施是危险的，因为移植的干细胞经常是无序生长，而这种生长方式通常能导致癌症发生。

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Another important feature of the transplanted cells is their ability to make nerve-cell-specific proteins and growth factors.

这种移植细胞另外的重要特点是他们形成神经细胞特异蛋白和生长因子。

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All transplanted cells have been marked with a fluorescent protein, which made possible to follow them in the recipients' brains.

所有移植细胞均已标记上荧光蛋白，这使跟踪它们成为可能。

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The researchers say the transplanted cells regenerated nerve fibres across the damaged region of the spinal cord.

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Taking donor cells from a close relation reduces the risk of rejection of the transplanted cells by the recipient.

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First, Dr Zhu tried it out on mice (the mice in question had had their immune systems turned off, so that they would not reject the transplanted cells).

ECONOMIST: Stem cells