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To exclude secondary effects of diabetes and HLA risk genotype on gut microbiota , we compared the intestinal microbiota composition in children with at least two diabetes - associated autoantibodies ( n = 18 ) with autoantibody - negative children matched for age , sex , early feeding history , and HLA risk genotype using pyrosequencing .
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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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