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In conclusion , tolerance to morphine - induced respiratory effects is much more limited than tolerance to its analgesic effects in repeatedly morphine - treated mice .
 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: morphine; Chemical: morphine