14381
However, X failed to react with a variety of antibodies against Rb or p107 , implicating the involvement of an E1A-binding protein other than Rb or p107 .
 ( protein: Rb, None) , ( protein: p107, None) , ( protein: Rb, None) , ( protein: X, None) , ( protein: E1A-binding protein, None) , ( protein: p107, 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: Rb, None) , ( protein: p107, None) , ( protein: Rb, None) , ( protein: X, None) , ( protein: E1A-binding protein, None) , ( protein: p107, None) 