14617
However, these cells have been impossible to generate given the requirement of GATA-1 for Epo receptor expression and red cell viability (C. Simon and S. Orkin, unpublished observations).
 ( protein: Epo receptor, None) , ( protein: GATA-1, None) , ( cell type: red cell, 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: Epo receptor, None) , ( protein: GATA-1, None) , ( cell type: red cell, None) 