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Gut microbiota regulates bile acid metabolism by reducing the levels of tauro - beta - muricholic acid , a naturally occurring FXR antagonist .
 Chemical: bile acid; Chemical: tauro - beta - muricholic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: bile acid; Chemical: tauro - beta - muricholic acid