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This arrangement of Ets sites , coupled with the tissue- and developmental-specific expression of Ets members , likely play a key role in defining the pattern of alpha 4 integrin .
 alpha 4 integrin, Ets members, Ets sites
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:
 alpha 4 integrin, Ets members, Ets sites