8928
The alpha2beta1 integrin , a collagen receptor on platelets and megakaryocytes , is required for normal platelet function .
 ( protein: alpha2beta1 integrin, None) , ( cell type: platelets, None) , ( cell type: megakaryocytes, 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: alpha2beta1 integrin, None) , ( cell type: platelets, None) , ( cell type: megakaryocytes, None) 