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The interleukin-1 receptor type I ( IL-1RI ) is associated with other proteins thus forming a complex system by which IL-1 exerts its various signals.
 complex system, interleukin-1 receptor type I, IL-1, IL-1RI
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:
 complex system, interleukin-1 receptor type I, IL-1, IL-1RI