14337
To dissect the molecular basis for the unusually persistent transcription of the IL-2R alpha gene , we analyzed nuclear NF-kappa B binding to a radiolabeled IL-2R alpha kappa B-specific oligonucleotide probe during the time course of CD2 + CD28 activation .
 IL-2R alpha, NF-kappa B, IL-2R alpha, CD28, CD2, 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:
 IL-2R alpha, NF-kappa B, IL-2R alpha, CD28, CD2, IL-2R alpha gene