6549
Erythropoietin ( EPO ) and its receptor ( EPOR ) are required for the development of mature erythrocytes.
 ( protein: EPOR, None) , ( protein: Erythropoietin, None) , ( protein: EPO, 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: EPOR, None) , ( protein: Erythropoietin, None) , ( protein: EPO, None) 