6740
Apart from its effect of augmenting morphine analgesia , BM also inhibits opioid - withdrawal induced hyperalgesia , and acquisition and expression of morphine tolerance .
 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