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The effects of two unselective potassium ( K ( + ) - ) channel blockers , quinine ( 12 . 5 , 25 and 50 mg / kg ) and 4 - aminopyridine ( 1 and 2 mg / kg ) , on conditioned place preference and biphasic changes in motor activity induced by morphine ( 10 mg / kg ) were tested in Wistar rats .
 Chemical: potassium; Chemical: K; Chemical: quinine; Chemical: 4 - aminopyridine; Chemical: morphine
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: potassium; Chemical: K; Chemical: quinine; Chemical: 4 - aminopyridine; Chemical: morphine