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In contrast, minimal or no activation of Stat3beta was observed, suggesting that IL-2 and IL-15 predominantly activate Stat3alpha in human CD4(+) T cells .
 human CD4(+) T cells, Stat3beta, Stat3alpha, IL-15, 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:
 human CD4(+) T cells, Stat3beta, Stat3alpha, IL-15, IL-2