11975
Twenty-two differences from the human sequence were found in the N-terminal region ( amino acids 1-421 ) of the squirrel monkey receptor.
 ( protein: N-terminal region, None) , ( protein: amino acids 1-421, 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: N-terminal region, None) , ( protein: amino acids 1-421, None) 