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In this study the effect of IL-10 on the expression of the protooncogene c-fos was investigated, because Fos plays a potential role in the regulation of B cell proliferation and differentiation .
 protooncogene c-fos, IL-10, c-fos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protooncogene c-fos, IL-10, c-fos