11881
Stimulation of blood platelets with alpha-thrombin or other platelet activators caused a rapid and strong induction of Rap1 that associated with RBD in vitro.
 ( protein: Rap1, None) , ( protein: RBD, None) , ( protein: alpha-thrombin, None) , ( cell type: blood platelets, 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: Rap1, None) , ( protein: RBD, None) , ( protein: alpha-thrombin, None) , ( cell type: blood platelets, None) 