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These amino acids cannot be absorbed to a significant extent by the colonic epithelium , but are precursors for the synthesis of numerous metabolic end products in reactions made by the microbiota .
 Chemical: amino acids
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: amino acids