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NF-kappa B was not activated by retinoic acid , which induced morphological differentiation of all the neuroblastoma cell lines used in the present study.
 NF-kappa B, neuroblastoma cell lines
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, neuroblastoma cell lines