A scientist has achieved a world first... by cloning himself.
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.
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