12259
The discrepancy in the degree of inhibition by membrane extracts and NK cells with mutant TNFRI suggests that additional pathways are utilized by NK cells to activate EC
 ( cell type: NK cells, None) , ( cell type: EC, None) , ( protein: mutant TNFRI, None) , ( cell type: NK cells, 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: NK cells, None) , ( cell type: EC, None) , ( protein: mutant TNFRI, None) , ( cell type: NK cells, None) 