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To characterise the IL - 6 - dependent fever generating pathway , we used microarray analysis to identify differentially expressed genes in the brain of lipopolysaccharide ( LPS ) - treated IL - 6 wild - type and knockout 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:
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