8264
Furthermore, the SH2-deleted Grf40 mutant led to a marked inhibition of these regulatory activities, the effect of which is apparently stronger than that of the SH2-deleted Grb2 mutant .
 ( protein: SH2-deleted Grb2 mutant, None) , ( protein: SH2-deleted Grf40 mutant, None) , ( protein: Grb2, None) , ( protein: Grf40, 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: SH2-deleted Grb2 mutant, None) , ( protein: SH2-deleted Grf40 mutant, None) , ( protein: Grb2, None) , ( protein: Grf40, None) 