1512
Using LPS-free and serum-free conditions , constitutive NF-kappa B can be detected in different cell lines of the monocytic lineage ( HL60 , U937 , THP-1 , Mono Mac 1 and Mono Mac 6 ), but not in Molt 4 T cells or K562 stem cells .
 THP-1, U937, monocytic lineage, Molt 4 T cells, Mono Mac 6, Mono Mac 1, cell lines, HL60, NF-kappa B, K562 stem 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:
 THP-1, U937, monocytic lineage, Molt 4 T cells, Mono Mac 6, Mono Mac 1, cell lines, HL60, NF-kappa B, K562 stem cells