20739
Transcriptional activity screening of the liver enriched OATP2B1 variant promoter identified hepatocyte nuclear factor 4 alpha ( HNF4 alpha ) as a novel transacting factor .
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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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