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All of the following are true regarding Friedreich's ataxia EXCEPT?
It is caused by a repeat mutation in the frataxin gene
Physical exam shows ataxia, loss of deep tendon reflexes, and extensor Babinski response
There is neuronopathy in the dorsal root ganglia, accompanied by the loss of peripheral sensory nerve fibers.
There is progressive loss of alpha-motor neurons in the anterior horn of the spinal cord
Age of onset is usually between 7 and 15 years
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