3935
Cystic fibrosis (CF) patients develop progressive cytokine -mediated inflammatory lung disease , with abundant production of thick, tenacious, protease -and oxidant-rich purulent airway secretions that are difficult to clear even with physiotherapy .
 ( protein: protease, None) , ( protein: cytokine, 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: protease, None) , ( protein: cytokine, None) 