By James Gallagher
Health reporter, BBC News
Treating Parkinson's disease with gene therapy has been shown to be successful in clinical trials for the first time, say US researchers.
The illness causes uncontrolled shaking, stiffness and slow movement as part of the brain dies.
The small study in The Lancet Neurology used a virus to add genes to brain cells, which resulted in reduced symptoms for half of patients.
Parkinson's UK welcomed the study, but said further research was needed.
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http://www.bbc.co.uk/news/health-12758230