24645
In the present study , we compared insulin secretion by voluntary feeding ( self - motivated , oral nutrient ingestion ) and by forced feeding ( intra - gastric nutrient injection via gavage ) in wild - type ( Kir6 . 2 + / + ) and Kir6 . 2 - / - mice .
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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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