In a study published in the January 31, 2014 issue of Science, an international team led by scientists at the University of California, San Diego School of Medicine report doubling the number of known causes for the neurodegenerative disorder known as hereditary spastic paraplegia. HSP is characterized by progressive stiffness and contraction of the lower limbs and is associated with epilepsy, cognitive impairment, blindness and other neurological features.
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