1039
We cultured M-TAT cells long term (> 1 year) in the continuous presence of erythropoietin ( EPO ), granulocyte-macrophage colony-stimulating factor ( GM-CSF ), or stem cell factor ( SCF ).
 ( protein: GM-CSF, None) , ( protein: SCF, None) , ( protein: EPO, None) , ( protein: granulocyte-macrophage colony-stimulating factor, None) , ( protein: stem cell factor, None) , ( cell line: M-TAT cells, None) , ( protein: erythropoietin, 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: GM-CSF, None) , ( protein: SCF, None) , ( protein: EPO, None) , ( protein: granulocyte-macrophage colony-stimulating factor, None) , ( protein: stem cell factor, None) , ( cell line: M-TAT cells, None) , ( protein: erythropoietin, None) 