Human embryonic stem cells have been coaxed into forming sperm-like cells, researchers report today. The cells have some of the hallmarks of sperm — they can swim, for example — but require much more characterization before they can be embraced as an experimental model for the study of inherited diseases and infertility. Meanwhile, the use of such cells to help infertile couples to have children remains a distant prospect; in several countries, including the UK, it would actually be illegal. (source: nature.com)
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