6701
The neural mechanism of parkinsonian motor symptoms , i . e . , rigidity , tremor and akinesia , which are the result of nigrostriatal dopamine deficiency , is interpreted from long - term observations on the effect of surgical and pharmacological treatment of the disease in relation to the neuropathological findings within the substantia nigra zona compacta ( SNc ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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