4512
However, in vitro clonal growth assays performed on peripheral blood from transgenic versus control mice revealed a marked reduction of myeloid progenitors , especially in those responding to granulocyte/ macrophage colony-stimulating factor .
 ( cell type: myeloid progenitors, None) , ( protein: granulocyte/ macrophage colony-stimulating factor, 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: myeloid progenitors, None) , ( protein: granulocyte/ macrophage colony-stimulating factor, None) 