9280
Pyrrolidine dithiocarbamate , a potent transcriptional inhibitor of the viral LTR , abrogated the cytokine responses in both U1 and ACH - 2 cells , suggesting a common TNF - alpha - mediated transcriptional mechanism in these cell types despite their different modes of provirus latency .
 viral LTR, TNF - alpha
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 viral LTR, TNF - alpha