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Taken together, our results suggest that IFN-alpha , IL-2 , IL-12 , and IL-15 have overlapping activities on human T cells .
 IL-15, human T cells, IL-2, IL-12, IFN-alpha
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:
 IL-15, human T cells, IL-2, IL-12, IFN-alpha