6915
The mAECA , but not normal human IgG , had anti-human aortic EC activity .
 ( protein: normal human IgG, None) , ( protein: mAECA, None) , ( protein: IgG, 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: normal human IgG, None) , ( protein: mAECA, None) , ( protein: IgG, None) 