14022
Emerging evidences indicate that activation of immune cells through pattern recognition receptors ( PRRs ) such as Toll - like receptors ( TLRs ) or Nod - like receptors ( NLRs ) may be critical mechanisms .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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