9853
They also suggest that the function of Spi-1 /PU.1 in the late phase of Friend leukemia requires specific signaling from the gp55 -modified EpoR generated during the early phase of the disease.
 ( protein: EpoR, None) , ( protein: gp55 -modified EpoR, None) , ( protein: Spi-1 /PU.1, None) , ( protein: gp55, None) , ( protein: /PU.1, None) , ( protein: Spi-1, 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: EpoR, None) , ( protein: gp55 -modified EpoR, None) , ( protein: Spi-1 /PU.1, None) , ( protein: gp55, None) , ( protein: /PU.1, None) , ( protein: Spi-1, None) 