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We conclude that IL-2 transcriptional regulation differs in tumor cell lines compared with normal T cells and that different costimulatory signals converge on the same cis-elements in the IL-2 promoter .
 normal T cells, cis-elements, IL-2, IL-2, IL-2 promoter, tumor cell lines
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:
 normal T cells, cis-elements, IL-2, IL-2, IL-2 promoter, tumor cell lines