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In the counterbalanced method , quinine attenuated morphine - induced place preference , whereas 4 - aminopyridine was ineffective .
 Chemical: quinine; Chemical: morphine; Chemical: 4 - aminopyridine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: quinine; Chemical: morphine; Chemical: 4 - aminopyridine