430
These findings suggest that mGlu ( 8 ) may partially mediate the antiparkinsonian effects of group III mGlu agonists in animal models of PD in which dopamine depletion or blockade of D ( 2 ) - like dopamine receptors is prolonged and indicate that selective activation of mGlu ( 8 ) may represent a novel therapeutic strategy for alleviating the motor symptoms of PD .
 dopamine, dopamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 dopamine, dopamine