11155
We previously demonstrated that while NE by itself does not activate human platelets , it strongly enhances the weak aggregation induced by a threshold concentration of cathepsin G (threshold of cathepsin G ) (Renesto, P., and Chignard, M. (1993) Blood 82, 139-144).
 ( cell type: human platelets, None) , ( protein: cathepsin G, None) , ( protein: NE, None) , ( protein: cathepsin G, 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:
 ( cell type: human platelets, None) , ( protein: cathepsin G, None) , ( protein: NE, None) , ( protein: cathepsin G, None) 