A unique genetic cause of Parkinson's disease has been traced to
a. a dominant mutation of a gene on chromosome 4.
b. overproduction of GABA within the caudate nucleus.
c. a recessive gene located on chromosome 8.
d. a loss of cholinergic neurons within the frontal cortex.
e. overproduction of dopamine within the basal ganglia.
Answer: a. a dominant mutation of a gene on chromosome 4.
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