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The effects of morphine ( 0 . 5 to 4 mg . / kg . i . v . ) on CP - induced behavioral modifications were tested administered alone and after naloxone ( 1 mg . / kg . s . c . ) .
 Chemical: morphine; Chemical: CP; Chemical: naloxone
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: morphine; Chemical: CP; Chemical: naloxone