6526
Pertussis toxin , which ADP -ribosylates the Gi proteins known to couple to the C5a receptor , produced minimal inhibition of C5a -induced IL-8 expression and had little effect on C5a -induced calcium mobilization in RAW264.7 cells .
 ( protein: IL-8, None) , ( cell line: RAW264.7 cells, None) , ( protein: Gi proteins, None) , ( protein: C5a receptor, 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: IL-8, None) , ( cell line: RAW264.7 cells, None) , ( protein: Gi proteins, None) , ( protein: C5a receptor, None) 