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In this study, we demonstrate that nuclear factor (NF)-kappa B and NF-kappa B-like transcription factors are activated after cross-linking CD40 on resting human tonsillar B cells and on B cell lines .
 B cells, NF-kappa B-like transcription factors, nuclear factor (NF)-kappa B, B cell lines, transcription factors, human tonsillar B cells, CD40
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:
 B cells, NF-kappa B-like transcription factors, nuclear factor (NF)-kappa B, B cell lines, transcription factors, human tonsillar B cells, CD40