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Strikingly, costimulation with EC results in a dramatic increase (up to 15-fold) in the c-Fos content of AP-1 .
 c-Fos, AP-1, EC
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:
 c-Fos, AP-1, EC