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These results indicate that activation of c-fos is involved in IL 6 -induced differentiation of SKW 6.4 cells into IgM-secreting cells .
 DNA: c-fos; cell line: IgM-secreting cells; protein: IL 6; cell line: SKW 6.4 cells
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:
 DNA: c-fos; cell line: IgM-secreting cells; protein: IL 6; cell line: SKW 6.4 cells