6870
Constitutive activations of PKB/Akt , STAT5a , and STAT5b were noted in these EPO -independent cells .
 ( protein: STAT5a, None) , ( cell line: EPO -independent cells, None) , ( protein: EPO, None) , ( protein: STAT5b, None) , ( protein: PKB/Akt, 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: STAT5a, None) , ( cell line: EPO -independent cells, None) , ( protein: EPO, None) , ( protein: STAT5b, None) , ( protein: PKB/Akt, None) 