An injection of stem cells has been used to cure mice with a normally fatal nervous system condition.
The therapy which helped repair faulty nerve wiring raises hopes of treatments for children with rare and deadly nervous leukodystrophy disorders.
A UK expert said human treatments were still some way off - but potentially the technique could be used to treat conditions such as multiple sclerosis.
The US study features in the journal Cell: Stem Cell.
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Professor David Attwell, from University College London, said the study represented an "important proof of principle" that transplantation of these "precursor" cells could help restore myelin not only within people with leukodystrophies, but in theory within those affected by other conditions involving loss of myelin, such as multiple sclerosis, cerebral palsy and spinal cord injury.
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more:
http://news.bbc.co.uk/1/hi/health/7435137.stm