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It is concluded that stereotypy can be evoked also in the case when the striatal dopaminergic tone is normal or even below normal : it is the equilibrium of the striatal cholinergic - dopaminergic systems which must be shifted towards dopamine , which is necessary for the development of this behavioral manifestation .
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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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