11973
The ligand-binding domain ( amino acids 528-777 ) of the squirrel monkey glucocorticoid receptor contains four amino acid differences ( Ser551 to Thr , Ser616 to Ala , Ala618 to Ser , and Ile761 to Leu ), all of which are present in owl monkey and cotton-top tamarin receptors .
 ( protein: glucocorticoid receptor, None) , ( protein: ligand-binding domain, None) , ( protein: amino acids 528-777, 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: glucocorticoid receptor, None) , ( protein: ligand-binding domain, None) , ( protein: amino acids 528-777, None) 