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Page last updated at 08:13 GMT, Wednesday, 8 July 2009 09:13 UK

Scepticism over lab sperm claim

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Scientists in Newcastle say they have achieved a world first by creating human sperm in a laboratory. The researchers believe the work could eventually help men with fertility problems to conceive. But other experts question the breakthrough. Professor Karim Nayernia, who has been leading the research at the University of Newcastle, and Dr Allan Pacey, senior lecturer in Andrology at the University of Sheffield, discuss the viability of the research.

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