6875
Constitutive STAT5 activity , activated through an unknown pathway not including JAK2 or EPOR , may act in concert with the constitutive PI3-kinase /PKB/Akt pathway to protect the EPO -independent HCD57-SREI cells from apoptosis and promote limited proliferation .
 ( protein: /PKB/Akt, None) , ( protein: EPO, None) , ( protein: JAK2, None) , ( protein: PI3-kinase, None) , ( protein: EPOR, None) , ( cell line: EPO -independent HCD57-SREI cells, None) , ( protein: STAT5, None) , ( cell line: HCD57-SREI cells, 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: /PKB/Akt, None) , ( protein: EPO, None) , ( protein: JAK2, None) , ( protein: PI3-kinase, None) , ( protein: EPOR, None) , ( cell line: EPO -independent HCD57-SREI cells, None) , ( protein: STAT5, None) , ( cell line: HCD57-SREI cells, None) 