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.
Writing in the journal Stem Cells and Development, the Newcastle team say it will be at least five years before the technique is perfected.
BBC NEWS | Health | Scientists claim sperm 'first'
Posted by chetan555 1050 days ago (http://news.bbc.co.uk)
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