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

Stem cell trials explained


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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