1576
In addition we assayed the level of mRNA encoding c-Fos , a common component of AP-1 and observed that it was indeed up-regulated in infected cells .
 ( cell type: infected cells, None) , ( RNA: mRNA, None) , ( protein: c-Fos, None) , ( protein: AP-1, 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:
 ( cell type: infected cells, None) , ( RNA: mRNA, None) , ( protein: c-Fos, None) , ( protein: AP-1, None) 