8406
The mechanism underlying such analgesia has been suggested to involve the interaction between the two separate but interconnected motivational systems " defense " and " pain . " To determine the developmental course of defense and nociception , these processes were analyzed during early ontogeny in rats .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None