8986
In vitro labeled receptors were incubated with various synthetic or natural agonists or antagonists and submitted to trypsin digestion .
 ( protein: trypsin, None) , ( protein: In vitro labeled receptors, 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: trypsin, None) , ( protein: In vitro labeled receptors, None) 