Moon also roped in his longtime collaborator, Philip Beachy, of the Stanford Institute for Stem Cell Biology and Regenerative Medicine.

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Professor Harry Moore, of the Centre for Stem Cell Biology at the University of Sheffield, UK, said there were a number of key differences between mice and human testes cells.

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Professor Ian MacKenzie, a researcher in stem cell biology from the Queen Mary School of Medicine and Dentistry in London, said that it was still likely that stem cells played a significant role in the development of cancer.

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Civin, director of the University of Maryland's stem-cell biology center.

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Dr Lorenz Studer, head of the Stem Cell and Tumor Biology Laboratory at the centre, and the lead researcher on the study, told BBC News Online that the study was "proof of principle" that cloned embryonic stem cells could be reliably transformed into a variety of useful cell types.

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Its purpose is to provide an exploration of the issues arising from current research in biology, particularly stem cell research.

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"The poor secretary was being quizzed about the scientific details of those 64 stem cell lines, " says Douglas Melton , chair of molecular biology at Harvard, who also testified yesterday.

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The citation for his knighthood credits Prof Wilmut with "revolutionising" biology through the cloning technique which underpins the science of stem cell technology.

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The best-known of the new knights is Professor Wilmut, who is said to have revolutionised biology by successfully pioneering the cloning technique that underpins the science of stem cell technology.

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