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In a microdialysis study , 10 muL of saline ( group C ; n = 8 ) or 30 mug of morphine ( group M ; n = 8 ) was injected intrathecally ( IT ) 0 . 5 h after reflow , and 30 mug of morphine ( group SM ; n = 8 ) or 10 muL of saline ( group SC ; n = 8 ) was injected IT 0 . 5 h after sham operation .
 Chemical: morphine; 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: morphine; Chemical: morphine