3156
The macrophage transcription factor PU.1 directs tissue-specific expression of the macrophage colony-stimulating factor receptor .
 ( protein: macrophage transcription factor, None) , ( protein: PU.1, None) , ( protein: macrophage colony-stimulating factor receptor, 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:
 ( protein: macrophage transcription factor, None) , ( protein: PU.1, None) , ( protein: macrophage colony-stimulating factor receptor, None) 