4010
With respect to arginine residues , only the two single mutations of R-276 and R-394 to alanine showed a dramatic decrease of agonist and antagonist binding whereas the R272A mutation showed only a slight effect.
 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:
 None