1222
In the present study , beta - funaltrexamine ( beta - FNA ) and naltrindole ( NTI ) ( nonequilibrium mu - and delta - antagonist , respectively ) were used to precipitate withdrawal in butorphanol - dependent rats .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None