6358
Blood samples were obtained prior to the injection and at 1, 2, 4, 8 and 24 hr after the injection.
 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:
 None