7455
Selective activation of STAT1alpha at the IFN-gamma receptor is achieved by specific interaction between a cytosolic tyrosine motif including Y440 in the IFN-gamma receptor alpha-chain and the SH2 domain of STAT1alpha .
 ( protein: IFN-gamma receptor, None) , ( protein: IFN-gamma, None) , ( protein: SH2 domain, None) , ( protein: IFN-gamma, None) , ( protein: cytosolic tyrosine motif, None) , ( protein: STAT1alpha, None) , ( protein: IFN-gamma receptor alpha-chain, None) , ( protein: STAT1alpha, None) , ( protein: Y440, 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: IFN-gamma receptor, None) , ( protein: IFN-gamma, None) , ( protein: SH2 domain, None) , ( protein: IFN-gamma, None) , ( protein: cytosolic tyrosine motif, None) , ( protein: STAT1alpha, None) , ( protein: IFN-gamma receptor alpha-chain, None) , ( protein: STAT1alpha, None) , ( protein: Y440, None) 