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At present, it is unclear whether the lack of PU.1 expression and activity in human multiple myeloma cell lines represents a malignancy-associated defect in these cells or exemplifies a normal developmental regulation in terminally differentiated B cells .
 cell type: terminally differentiated B cells; cell line: multiple myeloma cell lines; cell line: human multiple myeloma cell lines; protein: PU.1; 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:
 cell type: terminally differentiated B cells; cell line: multiple myeloma cell lines; cell line: human multiple myeloma cell lines; protein: PU.1; cell type: B cells