24483
CONCLUSIONS : Reduced sensitivity to DYN / KOR system activation during adolescence may be a contributing factor to the age - typical insensitivity to aversive properties of drugs commonly abused by adolescents .
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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:
 None