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Treatment of SKW 6.4 cells with IL 6 induced a transient and early stimulation of c-fos sense mRNA expression .
 protein: IL 6; RNA: c-fos sense mRNA
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: IL 6; RNA: c-fos sense mRNA