1508
In our studies, cells of the human monocytic line Mono Mac 6 , cultured in medium containing fetal-calf serum and low levels of lipopolysaccharide ( LPS ), also exhibit such 'constitutive' NF-kappa B , as demonstrated by mobility-shift analysis of nuclear extracts .
 NF-kappa B, Mono Mac 6, human monocytic line
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:
 NF-kappa B, Mono Mac 6, human monocytic line