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Northern (RNA) blots and binding assays showed that NF-IL6 is the only known C/EBP family member which is increased when U937 cells are activated.
 protein: NF-IL6; cell line: U937 cells; protein: C/EBP family member
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-IL6; cell line: U937 cells; protein: C/EBP family member