Page last updated at 16:16 GMT, Friday, 23 January 2009

Stem cell trials explained

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US regulators have cleared the way for the world's first study on human embryonic stem cell therapy.

Geron Corp, the biotech company behind the research, plans to initiate a clinical trial in patients paralysed due to spinal cord injury.

Fergus Walsh visited the company's laboratory to explain the importance of stem cells.

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