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PU.1 mRNA expression and PU.1 DNA binding activity , as measured by Northern blot analysis and electrophoretic mobility shift assay , respectively, were evident in cell lines representing pro-B , pre-B , and mature B cells .
 cell line: cell lines; protein: PU.1; protein: PU.1; RNA: PU.1 mRNA
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: cell lines; protein: PU.1; protein: PU.1; RNA: PU.1 mRNA