To his surprise, this gave rise to a Siamese twin embryo where an extra head was generated from the transplanted cells.

没想到，这产生了一个连体胚胎，植入的细胞产生了一个额外的头部。

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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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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