6678
We have now investigated the mechanism of action of a new analogue of UP , PNU156804 , which shows a more favorable activity profile than UP in mice .
 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