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We have examined the effect of leukotriene B4 ( LTB4 ), a potent lipid proinflammatory mediator , on the expression of the proto-oncogenes c-jun and c-fos .
 protein: proinflammatory mediator
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: proinflammatory mediator