1045
These results support the hypothesis that EPO actively influences the programming of gene expression required for erythroid progenitor cell differentiation .
 ( protein: EPO, None) , ( cell type: erythroid progenitor 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, None) , ( cell type: erythroid progenitor cell, None) 