15157
We found that treatment of both differentiated dopaminergic - like SH - SY5Y cells and rat midbrain slices with the dopamine D2 receptor ( D2R ) agonist , quinpirole , triggered an increase in the expression of GDNF that was temporally preceded by an increase in the levels of zinc - finger protein 268 ( Zif268 ) , a DNA - binding transcription factor encoded by an immediate - early gene .
 Chemical: dopamine; Chemical: quinpirole; Chemical: zinc
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: dopamine; Chemical: quinpirole; Chemical: zinc