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The ability of DHPG to increase PKA - dependent phosphorylation of GluA1 depends on concomitant activation of the dopamine - and cAMP - regulated phosphoprotein of 32kDa ( DARPP - 32 ) .
 DHPG, dopamine, cAMP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DHPG, dopamine, cAMP