999
When restimulated, however, anergic T cells fail to up-regulate transcription of the IL-2 gene and in consequence do not produce IL-2 .
 IL-2, anergic T cells, IL-2 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-2, anergic T cells, IL-2 gene