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The role of the intestinal microbiota as a regulator of autoimmune diabetes in animal models is well - established , but data on human type 1 diabetes are tentative and based on studies including only a few study subjects .
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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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