7735
Whereas the NF-kappaB binding activity in Tax -expressing T-cell lines consisted mostly of p50/c-Rel , fresh ATL samples contained p50/p50 and p50/p65 heterodimers .
 ( protein: p50/c-Rel, None) , ( protein: NF-kappaB, None) , ( protein: Tax, None) , ( cell line: Tax -expressing T-cell lines, 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: p50/c-Rel, None) , ( protein: NF-kappaB, None) , ( protein: Tax, None) , ( cell line: Tax -expressing T-cell lines, None) 