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PMA treatment , and not retinoic acid treatment of the U937 cells acts in inducing NF-KB expression in the nuclei .
 protein: NF-KB; cell line: U937 cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: NF-KB; cell line: U937 cells