1120
Thus, failure of virus-exposed T cells to produce Fos and Jun could contribute to the increase in illness due to influenza virus in the elderly .
 Fos, T cells, virus-exposed T cells, Jun
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:
 Fos, T cells, virus-exposed T cells, Jun