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Finally , icv administration of DCPG ameliorates forelimb use asymmetry caused by unilateral 6 - hydroxydopamine lesion of substantia nigra dopamine neurons .
 DCPG, 6 - hydroxydopamine, dopamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DCPG, 6 - hydroxydopamine, dopamine