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Also in the current study, binding activity to the CD28RE /AP-1 sequence of the IL-2 promoter is evaluated.
 CD28RE, IL-2 promoter, CD28RE /AP-1 sequence, IL-2
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:
 CD28RE, IL-2 promoter, CD28RE /AP-1 sequence, IL-2