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Page last updated at 07:25 GMT, Wednesday, 8 July 2009 08:25 UK

Scientists claim sperm creation 'first'

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Scientists in Newcastle claim to have created human sperm in the laboratory in what they say is a world first.

The researchers believe the work could eventually help men with fertility problems to conceive.

But other experts say they are not convinced that fully developed sperm have been created.

Fergus Walsh reports.

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