5601
Cytotoxicity markers assessed include tumor cell killing , IL-1 secretion , reactive oxygen intermediate release , nitric oxide synthetase activity as measured by the release of reactive nitrogen intermediates , complement receptor-1 cell surface protein , and TNF-alpha protein presence .
 ( protein: IL-1, None) , ( protein: TNF-alpha protein, None) , ( protein: complement receptor-1 cell surface protein, None) , ( protein: Cytotoxicity markers, None) , ( protein: nitric oxide synthetase, 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: IL-1, None) , ( protein: TNF-alpha protein, None) , ( protein: complement receptor-1 cell surface protein, None) , ( protein: Cytotoxicity markers, None) , ( protein: nitric oxide synthetase, None) 