15159
We used adenoviral delivery of small hairpin RNA ( shRNA ) targeting Zif268 to down - regulate its expression and found that Zif268 is specifically required for the D2R - mediated up - regulation of GDNF .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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