25178
Compared to vehicle - pretreated rats , inhibitor - pretreated rats had : a ) lower analgesia in the tail - flick test ( p < 0 . 05 ) and lower areas under the analgesia - time curve ( p < 0 . 02 ) within the first hour after 30mg / kg subcutaneous codeine , b ) lower morphine concentrations and morphine to codeine ratios in the brain ( p < 0 . 02 and p < 0 . 05 , respectively ) , but not in plasma ( p > 0 . 6 and p > 0 . 7 , respectively ) , tested at 30min after 30mg / kg subcutaneous codeine , and c ) lower morphine formation from codeine ex vivo by brain membranes ( p < 0 . 04 ) , but not by liver microsomes ( p > 0 . 9 ) .
 Chemical: codeine; Chemical: morphine; Chemical: morphine; Chemical: codeine; Chemical: codeine; Chemical: morphine; Chemical: codeine
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: codeine; Chemical: morphine; Chemical: morphine; Chemical: codeine; Chemical: codeine; Chemical: morphine; Chemical: codeine