4349
We demonstrate that Pb at physiologically relevant concentrations activates NF-kappa B in primary human CD4+ T lymphocytes .
 NF-kappa B, primary human CD4+ T lymphocytes
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, primary human CD4+ T lymphocytes