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We found that erythropoietin ( EPO ) and stem cell factor ( SCF ) activated protein kinase B ( PKB/Akt ) in EPO -dependent HCD57 erythroid cells .
 ( protein: activated protein kinase B, None) , ( cell line: EPO -dependent HCD57 erythroid cells, None) , ( protein: EPO, None) , ( protein: PKB/Akt, None) , ( protein: SCF, None) , ( protein: stem cell factor, None) , ( protein: EPO, None) , ( protein: erythropoietin, 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: activated protein kinase B, None) , ( cell line: EPO -dependent HCD57 erythroid cells, None) , ( protein: EPO, None) , ( protein: PKB/Akt, None) , ( protein: SCF, None) , ( protein: stem cell factor, None) , ( protein: EPO, None) , ( protein: erythropoietin, None) 