22781
Chromatin immunoprecipitation ( ChIP ) and nuclease hypersensitivity assays showed that Chd4 , interacting with Hdac1 / 2 , cooperates with its related proteins Kap1 and Cbx1 to bind at - 207 / - 148 of the Sox9 promoter .
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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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