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Similarly , gallein pretreatment did not potentiate morphine - conditioned place preference responses or morphine - induced constipation , as measured as a reduction in excreta .
 Chemical: gallein; Chemical: morphine; 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: gallein; Chemical: morphine; Chemical: morphine