23411
Murabutide is a safe derivative of MDP , which interacts with cells of the immune system , both innate and adaptive , and exerts its effect through activation of Nod2 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None