14589
We find that a short enhancer element containing the NF-kappa B binding site from the interleukin-2 receptor alpha-chain gene ( IL-2R alpha ) is preferentially activated in T cells .
 interleukin-2, NF-kappa B binding site, interleukin-2 receptor alpha-chain gene, IL-2R alpha, T cells
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:
 interleukin-2, NF-kappa B binding site, interleukin-2 receptor alpha-chain gene, IL-2R alpha, T cells