7511
Epo caused an increase in the proportion of cells expressing cell surface glycophorin A ( GPA ) and up-regulated beta- and gamma- globin by several fold.
 ( protein: Epo, None) , ( protein: glycophorin A, None) , ( protein: GPA, 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) , ( protein: glycophorin A, None) , ( protein: GPA, None) 