8682
The finding of Tax mutants segregating these two pathways suggested that the NF-kappaB pathway was essential for IL-2 -independent growth of CTLL-2 cells while the CRE pathway was unnecessary.
 IL-2, NF-kappaB, CRE, Tax, CTLL-2 cells
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:
 IL-2, NF-kappaB, CRE, Tax, CTLL-2 cells