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The present work has examined the effects of okadaic acid , an inhibitor of type 1 and 2A protein phosphatases , on the regulation of c-jun expression during monocytic differentiation of U-937 leukemia cells .
 cell line: U-937 leukemia cells; DNA: c-jun
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:
 cell line: U-937 leukemia cells; DNA: c-jun