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American researchers have extracted stem cells from a human embryo produced using cloning technology for the first time.
The research provides the first conclusive evidence that adult human cells can be reprogrammed to a primordial state.
But the difficult procedure was achieved only by producing an unviable embryo and genetically abnormal embryonic cells, which have three, rather than the usual two, sets of chromosomes.
Since the birth of Dolly the cloned sheep in 1996, scientists have wondered whether a controversial technique, initially called therapeutic cloning and now known as somatic cell nuclear transfer, was possible with human tissue.
It is regarded as having great medical promise because it would generate embryonic stem cells that are perfectly matched to a patient. More Read
The research provides the first conclusive evidence that adult human cells can be reprogrammed to a primordial state.
But the difficult procedure was achieved only by producing an unviable embryo and genetically abnormal embryonic cells, which have three, rather than the usual two, sets of chromosomes.
Since the birth of Dolly the cloned sheep in 1996, scientists have wondered whether a controversial technique, initially called therapeutic cloning and now known as somatic cell nuclear transfer, was possible with human tissue.
It is regarded as having great medical promise because it would generate embryonic stem cells that are perfectly matched to a patient. More Read
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