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An IL-2 response element in the human IL-2 receptor alpha chain promoter is a composite element that binds Stat5 , Elf-1 , HMG-I(Y) and a GATA family protein .
 IL-2 response element, Elf-1, GATA family protein, human IL-2 receptor alpha chain promoter, Stat5, HMG-I(Y), composite element
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-2 response element, Elf-1, GATA family protein, human IL-2 receptor alpha chain promoter, Stat5, HMG-I(Y), composite element