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The findings in the human multiple myeloma cell lines represent the first examples of B cells with downregulated PU.1 expression and apparently contradict observations in the murine system in which PU.1 is expressed and active in plasmacytoma cell lines .
 protein: PU.1; protein: PU.1; cell line: multiple myeloma cell lines; cell line: human multiple myeloma cell lines; cell line: plasmacytoma cell lines; cell type: B 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: PU.1; protein: PU.1; cell line: multiple myeloma cell lines; cell line: human multiple myeloma cell lines; cell line: plasmacytoma cell lines; cell type: B cells