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Age - related gut microbiota modifications are associated with immunosenescence and inflamm - ageing in a sort of self - sustaining loop , which allows the placement of gut microbiota unbalances among both the causes and the effects of the inflamm - ageing process .
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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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