1102
Insertion of this chimeric promoter ( ISG15 LTR ) upstream of the human IFNA2 gene directed high levels of IFN synthesis in Tat-expressing cells , while this promoter was not responsive to tumor necrosis factor alpha -mediated activation .
 tumor necrosis factor alpha, IFN, ISG15 LTR, Tat-expressing cells, chimeric promoter, human IFNA2 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:
 tumor necrosis factor alpha, IFN, ISG15 LTR, Tat-expressing cells, chimeric promoter, human IFNA2 gene