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 .
 IL-1, TNF-alpha protein, complement receptor-1 cell surface protein, Cytotoxicity markers, nitric oxide synthetase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 IL-1, TNF-alpha protein, complement receptor-1 cell surface protein, Cytotoxicity markers, nitric oxide synthetase