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We studied mouse osteoblasts alone or in a co - culture with HGC to determine whether TZD inhibition of aromatase plays a role in their effects on bone metabolism .
 Chemical: TZD
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: TZD