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Interleukin 12 ( IL-12 ) is an important immunoregulatory cytokine whose receptor is a member of the hematopoietin receptor superfamily .
 IL-12, hematopoietin receptor superfamily, Interleukin 12, immunoregulatory cytokine
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-12, hematopoietin receptor superfamily, Interleukin 12, immunoregulatory cytokine