4616
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 .
 ( protein: transcription factor, None) , ( protein: NF-kappa B, None) , ( DNA: LTR, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: transcription factor, None) , ( protein: NF-kappa B, None) , ( DNA: LTR, None) 