11151
However , in PAG , in contrast to brainstem , superactivation of AC was observed in morphine - treated mice in comparison to controls ( p < 0 . 05 ) .
 Chemical: morphine
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: morphine