9171
Prolonged suppression of trans- gene expression for up to 7 days was observed after doxycycline was removed from the cultures, but eventual recovery of surface expression was complete, and the absolute time to recovery was directly proportional to the initial concentration of the drug.
 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