3901
p38 and p63 may provide a docking site for Grb2 , thereby linking Grb2 SH3-binding proteins SOS1 , SLP-76 , and p120 to downstream signalling events .
 ( protein: SOS1, None) , ( protein: Grb2 SH3-binding proteins, None) , ( protein: SLP-76, None) , ( protein: p38, None) , ( protein: Grb2, None) , ( protein: p63, None) , ( protein: p120, None) , ( protein: Grb2, 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: SOS1, None) , ( protein: Grb2 SH3-binding proteins, None) , ( protein: SLP-76, None) , ( protein: p38, None) , ( protein: Grb2, None) , ( protein: p63, None) , ( protein: p120, None) , ( protein: Grb2, None) 