4098
Activation of Stat 5b in erythroid progenitors correlates with the ability of ErbB to induce sustained cell proliferation .
 ( cell type: erythroid progenitors, None) , ( protein: ErbB, None) , ( protein: Stat 5b, 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:
 ( cell type: erythroid progenitors, None) , ( protein: ErbB, None) , ( protein: Stat 5b, None) 