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Interleukin-12 ( IL-12 ) is a cytokine that exhibits pleiotropic effects on lymphocytes and natural killer cells and has been shown to have promise for the immunotherapy of cancer.
 natural killer cells, IL-12, Interleukin-12, cytokine, lymphocytes
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:
 natural killer cells, IL-12, Interleukin-12, cytokine, lymphocytes