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Protein kinase C activation and protooncogene expression in differentiation/retrodifferentiation of human U-937 leukemia cells .
 DNA: protooncogene; cell line: human U-937 leukemia cells; protein: Protein kinase C
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:
 DNA: protooncogene; cell line: human U-937 leukemia cells; protein: Protein kinase C