1645
We show that the myeloid and B cell transcription factor PU.1 binds specifically to this site.
 protein: B cell transcription factor; protein: PU.1
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: B cell transcription factor; protein: PU.1