Scientists say they have managed for the first time to create artificial sperm cells, a development that the popular press has seized upon as a sign that sterile men -- and even women -- may be able to fertilize eggs in the future.
The researchers turned adult stem cells from bone marrow into immature sperm cells. They're excited about the discovery, but say that it could take three to five years to develop a process whereby the cells develop into the more mature sperm cells found in the testes.
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