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Each concentration of progesterone ( 6 . 25 , 12 . 5 , 25 , and 50 micrograms / ml ) caused a significant and concentration - dependent reduction in the AD50 for bupivacaine .
 Chemical: progesterone; Chemical: bupivacaine
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: progesterone; Chemical: bupivacaine