2809
We previously showed that granulocyte-macrophage colony-stimulating factor ( GM-CSF ) and macrophage colony-stimulating factor ( M-CSF ) stimulate the differentiation of human monocytes into two phenotypically distinct types of macrophages .
 ( protein: M-CSF, None) , ( protein: macrophage colony-stimulating factor, None) , ( protein: granulocyte-macrophage colony-stimulating factor, None) , ( protein: GM-CSF, None) , ( cell type: human monocytes, None) , ( cell type: macrophages, 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: M-CSF, None) , ( protein: macrophage colony-stimulating factor, None) , ( protein: granulocyte-macrophage colony-stimulating factor, None) , ( protein: GM-CSF, None) , ( cell type: human monocytes, None) , ( cell type: macrophages, None) 