710
PU.1 and Spi-B have been previously described as being predominantly expressed coordinately in macrophages and B cells , but their expression in early hematopoietic stages and during the course of myeloid differentiation to monocytes and macrophages or to neutrophils has not been extensively investigated.
 ( cell type: macrophages, None) , ( cell type: macrophages, None) , ( protein: PU.1, None) , ( cell type: monocytes, None) , ( cell type: B cells, None) , ( cell type: neutrophils, None) , ( protein: Spi-B, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: macrophages, None) , ( cell type: macrophages, None) , ( protein: PU.1, None) , ( cell type: monocytes, None) , ( cell type: B cells, None) , ( cell type: neutrophils, None) , ( protein: Spi-B, None) 