2066
Recent findings suggest an involvement of reactive oxygen species in the pathway of TPA and protein kinase C leading to expression of c-fos and c-jun mRNA .
 ( protein: protein kinase C, 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:
 ( protein: protein kinase C, None) 