11631
Residues 432 , 435 , 437 , 438 , and 440 ( position P1 , P4 , P6 , P7 , and P9 ) contributed to DQ2 binding , whereas residues 431 , 433 , 434 , and 436 ( positions P 1 , P2 , P3 , and P5 ) contributed to TCR contact.
 ( protein: DQ2, None) , ( protein: TCR, 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: DQ2, None) , ( protein: TCR, None) 