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However , exposure to inhibitors down - regulated the expression levels , mainly in 7 - ketocholesterol - incubated cells .
 Chemical: 7 - ketocholesterol
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: 7 - ketocholesterol