12254
Western blotting of NK cell and membrane extracts detected the presence of Lymphotoxin-alpha ( LTalpha ) but not tumor necrosis factor-alpha .
 ( protein: Lymphotoxin-alpha, None) , ( protein: tumor necrosis factor-alpha, None) , ( protein: LTalpha, None) , ( cell type: NK cell, 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: Lymphotoxin-alpha, None) , ( protein: tumor necrosis factor-alpha, None) , ( protein: LTalpha, None) , ( cell type: NK cell, None) 