29986
To explore the long - term effects of DPP4 inhibition on insulin secretion and beta cell mass , we have generated a high - fat diet ( HFD ) - induced - obesity model in mice of advanced age ( 10 months old ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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