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To find new regulatory regions of the IL-2R alpha gene , 8.5 kb of the 5' end noncoding sequence of the IL-2R alpha gene have been sequenced.
 regulatory regions, IL-2R alpha gene, IL-2R alpha, IL-2R alpha, IL-2R alpha gene
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:
 regulatory regions, IL-2R alpha gene, IL-2R alpha, IL-2R alpha, IL-2R alpha gene