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Although the mechanism of LTR activation remains obscure, several lines of investigation have suggested that it is a result of activation of the NF-kappa B transcription factor (s) following signaling events related to generalized DNA damage .
 transcription factor, NF-kappa B, LTR
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:
 transcription factor, NF-kappa B, LTR