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Page last updated at 07:07 GMT, Friday, 24 April 2009 08:07 UK

Next stage for stem cell research

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Pharmaceutical giant Pfizer is investing heavily in stem cell research for the first time. Reporter Angus Stickler speaks to Ruth McKernan, of Pfizer, about a therapy which could cure one of the most common forms of blindness in older people. Professor Pete Coffey, of University College London, discusses what this says about the future of stem cell research.

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