13029
Unexpectedly, we found that conventional procedures employed to prepare cellular extracts cause the release of proteolytic activities that are normally stored in intracellular granules , resulting in the degradation of various NF-kappaB /Rel and STAT proteins .
 ( protein: NF-kappaB, None) , ( protein: NF-kappaB /Rel, None) , ( protein: STAT proteins, 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: NF-kappaB, None) , ( protein: NF-kappaB /Rel, None) , ( protein: STAT proteins, None) 