2100
Induction of HIV-1 - LTR -driven transcription in THP-1 cells by superantigens was associated with the induction of nuclear factor-kappa B DNA-binding activity .
 ( DNA: LTR, None) , ( protein: superantigens, None) , ( protein: nuclear factor-kappa B, None) , ( cell line: THP-1 cells, 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:
 ( DNA: LTR, None) , ( protein: superantigens, None) , ( protein: nuclear factor-kappa B, None) , ( cell line: THP-1 cells, None) 