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Phosphorylated AMPKa ( p - AMPK ) in the myocardium was significantly elevated by 25mg / kg of metformin , slightly by 50mg / kg , but not by 100mg / kg .
 Chemical: metformin
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: metformin