17614
The objective of this study was to determine the effect of G beta gamma - subunit inhibition on antinociception and other pharmacological effects , such as respiratory depression , constipation , and hyperlocomotion , mediated by the mu - opioid receptor .
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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