T-ing up a new target for Parkinson's disease treatment Parkinson disease (PD) affects 1-2% of the population over the age of 65 years. It results from loss or loss of function of nerve cells in the brain that coordinate movement. As a result, the hallmark symptoms of PD are trembling in hands, arms, legs, jaw, and face; stiffness of the limbs and trunk; slowness of movement; and impaired balance and coordination. There is no cure for PD, but symptoms can be alleviated with a variety of drugs... 
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