9849
Although devoid of any effect by itself, a mutant p53 cooperated with Spi-1 and EpoR (R129C) to reinforce both phenotypes.
 ( protein: EpoR, None) , ( protein: mutant p53, None) , ( protein: Spi-1, None) , ( protein: EpoR (R129C), 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: mutant p53, None) , ( protein: Spi-1, None) , ( protein: EpoR (R129C), None) 