13806
We used this parabrachial circuit as a model to assess cellular actions of ultra - low doses of ( - ) - naloxone and ( + ) - naloxone in modifying the effects of DAMGO .
 Chemical: ( - ) - naloxone; Chemical: ( + ) - naloxone; Chemical: DAMGO
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ( - ) - naloxone; Chemical: ( + ) - naloxone; Chemical: DAMGO