15162
These results suggest that D2R activation induces a G beta gamma - and extracellular signal - regulated kinase 1 / 2 - dependent increase in the level of Zif268 , which functions to directly up - regulate the expression of GDNF .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None