In a breakthrough certain to provoke an ethical furore, Samuel Wood created embryo copies of himself by placing his skin cells in a woman's egg.
The embryos were the first to be made from cells taken from adult humans.
Although they survived for only five days and were smaller than a pinhead, they are seen as a milestone in the quest for treatments for diseases such as Alzheimer's and Parkinson's.
But critics fear the technology could be exploited by mavericks to clone babies and accused the scientists of reducing the miracle of human life to a factory of spare parts.
Researchers from the Californian stem cell research company Stemagen employed the same technique used to make Dolly the sheep, the world's first cloned mammal, to create the embryos.
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