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 .
 p50/c-Rel, NF-kappaB, Tax, Tax -expressing T-cell lines
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:
 p50/c-Rel, NF-kappaB, Tax, Tax -expressing T-cell lines