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Instead, we propose that ligation of a distinct inhibitory receptor leads to the recruitment of SHP1 via its SH2 domains , activation of SHP1 and subsequently inhibition of TCR signals if the inhibitory receptor is juxtaposed to the TCR .
 ( protein: SH2 domains, None) , ( protein: SHP1, None) , ( protein: TCR, None) , ( protein: inhibitory receptor, None) , ( protein: TCR, None) , ( protein: inhibitory receptor, None) , ( protein: SHP1, 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 domains, None) , ( protein: SHP1, None) , ( protein: TCR, None) , ( protein: inhibitory receptor, None) , ( protein: TCR, None) , ( protein: inhibitory receptor, None) , ( protein: SHP1, None) 