9896
Thus , KCNK1 and Kcnk1 ( - / - ) mice provide an experimental tool for further investigation into the molecular mechanism of CAR - mediated promotion of the development of hepatocellular carcinoma in mice .
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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:
 None