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To test whether Metformin directly affects ghrelin cells , rat primary stomach cells were treated with Metformin and the levels of ghrelin secretion , proghrelin gene expression and activation of adenosine monophosphate - activated protein kinase ( AMPK ) were examined .
 Chemical: Metformin; Chemical: Metformin; Chemical: adenosine monophosphate
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: Metformin; Chemical: Metformin; Chemical: adenosine monophosphate