6867
Protein kinase B ( c-Akt ), phosphatidylinositol 3-kinase , and STAT5 are activated by erythropoietin ( EPO ) in HCD57 erythroid cells but are constitutively active in an EPO -independent, apoptosis -resistant subclone ( HCD57-SREI cells ).
 ( protein: EPO, None) , ( cell line: HCD57-SREI cells, None) , ( protein: phosphatidylinositol 3-kinase, None) , ( protein: c-Akt, None) , ( protein: erythropoietin, None) , ( cell line: HCD57 erythroid cells, None) , ( cell line: EPO -independent, apoptosis -resistant subclone, None) , ( protein: STAT5, None) , ( protein: EPO, None) , ( protein: Protein kinase B, 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 line: HCD57-SREI cells, None) , ( protein: phosphatidylinositol 3-kinase, None) , ( protein: c-Akt, None) , ( protein: erythropoietin, None) , ( cell line: HCD57 erythroid cells, None) , ( cell line: EPO -independent, apoptosis -resistant subclone, None) , ( protein: STAT5, None) , ( protein: EPO, None) , ( protein: Protein kinase B, None) 