6481
However , the molecular mechanisms of GIP secretion and high fat diet ( HFD ) - induced GIP hypersecretion remain unclear , primarily due to difficulties in separating K - cells from other intestinal epithelial cells in vivo .
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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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