4200
Nevertheless, forskolin also inhibits PKC downstream events , such as c-jun expression , which is critical for the activation process of T cells .
 ( DNA: c-jun, None) , ( cell type: T cells, None) , ( protein: PKC, 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:
 ( DNA: c-jun, None) , ( cell type: T cells, None) , ( protein: PKC, None) 